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Dissertations / Theses on the topic 'Extraction processes'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Medina-López, Encarnación. "Thermodynamic processes involved in wave energy extraction." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31422.

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Wave energy is one of the most promising renewable energy sources for future exploitation. This thesis focuses on thermodynamic effects within Oscillating Water Column (OWC) devices equipped withWells turbines, particularly humidity effects. Previous theoretical studies of the operation of OWCs have resulted in expressions for the oscillation of the water surface in the chamber of an OWC based on linear wave theory, and the air expansion{compression cycle inside the air chamber based on ideal gas theory. Although in practice high humidity levels occur in OWC devices open to the sea, the influe

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2

Ali, Mehmood. "Enhancing oil extraction processes for flaxseed and microalgae." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6970/.

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Sustainable biodiesel can be produced by processing vegetable oil seeds or microalgae. The processing includes numerous processes which impact the quality and cost of the final product. Oil extraction from the feedstock is one of the most energy intensive parts of the process in the production chain. Oil extraction methods are influenced by the operational physical parameters or chemical characteristics, and their selection greatly impacts the final oil yields. This thesis investigates and compares different oil extraction methods and tries to fill the research gaps in the oil extraction proce

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3

Haupt, Petronella. "Effective solvent extraction of coal and subsequent separation processes." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-08282007-113611.

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Thesis (M. Eng.)(Chemical Engineering)--University of Pretoria, 2006.<br>Accompanied by a CD-ROM containing Matlab programs. Includes bibliographical references. Available on the Internet via the World Wide Web.

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4

Manic, Marina. "Alternative solvents in separation processes." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8774.

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Dissertation presented to obtain the Ph.D degree in Sustainable Chemistry<br>Fundação para a Ciência e Tecnologia - through doctoral fellowship SFRH/BD/45323/2008, and grant No Pest-C/EQB/LA0006/2011; partially supported from the Conselho de Reitores das Universidades Portuguesas (CRUP) – Integrated project Portugal-Spain, No E-95/10.

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5

Ghorashi, Shahab. "Attentional spatial selection and identity extraction are separable cognitive processes." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/6475.

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While searching for objects in a cluttered environment, observers confront two tasks: selecting where to search, and identifying the targets. Chapter 1 reviews major theories of visual search, and highlights their approaches to these two functions. While anatomical, neurological, and behavioural evidence suggests dissociation between spatial selection and identity extraction, there is a vast controversy about this issue among visual-search accounts. This review demonstrates that none of these theories has adopted the right tool to independently manipulate the two functions. A new methodolo

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6

Awasthi, Alok. "Silicothermic Processes for Extraction and Refining of Niobium and Tantalum." Kyoto University, 2001. http://hdl.handle.net/2433/150146.

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7

Rashid, Salman Ghanem. "Studies on copper extraction with hydroxyoxime extractants for the design of hollow fibre membrane based extraction processes." Thesis, University of South Wales, 1999. https://pure.southwales.ac.uk/en/studentthesis/studies-on-copper-extraction-with-hydroxyoxime-extractants-for-the-design-of-hollow-fibre-membrane-based-extraction-processes(7e631b77-71e2-4d6e-8c03-4636d42f9f69).html.

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This work has included a review of the most relevant aspects of measurement techniques and mathematical models proposed in the literature to assess the equilibrium and mass transfer data of metal extraction by the use of chelating agents. The limitations of these techniques and models have been highlighted. Three chelating extractants diluted in EscaidllO were used to study the extraction equilibrium of copper. The extractants are 5-nonylacetophenone oxime (LIX84®), 5- dodeylsalicylaldoxime (LIX860®) and 50/50 v/v mixture of both oximes (LIX984®). The copper concentration changes in the aqueou

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8

Gong, Xun. "Triangle-mesh based cutter-workpiece engagement extraction for general milling processes." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45143.

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This thesis presents a novel geometric modeling methodology of cutter-workpiece engagement extraction for general milling processes. Cutter-workpiece engagement (CWE) geometry is the instantaneous contact area between the cutter and the in-process workpiece. It defines how the cutting edge enters and exits the workpiece. It plays a crucial role for process simulation and directly effects the calculation of cutting force, torque and et cetera. Based on the result of physical simulation, the milling process can be optimized and the machining performance can be improved. Successful optimizat

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9

Smith, R. W. "The extraction and recognition of text from multimedia document images." Thesis, University of Bristol, 1987. http://hdl.handle.net/1983/c1de9e88-004f-4ee7-8060-e7cf025e86b6.

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10

Van, Dyk Braam. "Computerized design of solvents for extractive processes." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52171.

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Thesis (PhDEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: Separation processes are an integral part of chemical engineering. The purity of a chemical product is among the principal factors influencing its value. Therefore, any method that can increase the purity of a product or decrease the cost of purification will have a direct effect on the profitability of the entire plant. An important class of separation processes is the solvent-based separations. This includes processes like extractive distillation, liquid-liquid extraction and chromatographic separation. Heterogen

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11

Carter, Helen. "Uranium separations using extraction chromatography." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/11261.

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In the analysis of environmental samples for uranium and thorium pollutants and at natural levels for the dating of geological samples there was felt a need to develop better uranium and thorium separation procedures to replace the established anion exchange method used at AEA Technology plc. This was the first aim of the PhD research. Separation of uranium from thorium prior to measurement of the isotopes by alpha spectrometry was necessary due to the similar alpha energies of234U and 230Th. TRU and UTEVA extraction chromatography resins (EIChroM Industries) were investigated as potential rep

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12

Savastano, Cesar Alberto. "Interfacial phenomena and rate processes in the extraction of nickel by mixed reagents." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47247.

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13

Storm, Sandra [Verfasser]. "Molecular Modeling and Experimental Design of Surfactant-Based Extraction Processes / Sandra Storm." München : Verlag Dr. Hut, 2015. http://d-nb.info/1071513109/34.

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14

Chen, Fu-Yih Jeffrey. "Characterization of the liquid-liquid interface and its influence on metal extraction processes." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186977.

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8-Mercaptoquinoline (QSH) exhibited substantial interfacial activity in its neutral form. The interfacial activity of QSH may stem from its zwitterionic form QH⁺S⁻. The interfacial activities of Ni-HPMBP system are in the order Ni(PMBP)₂ > PMBP⁻ > HPMBP. The interfacial rate constant of formation reaction is 4 times greater than the bulk value. The bulk and interfacial rate constants for dissociation reaction of Ni(PMBP)₂ are essentially the same. The centrifugal partition chromatography (CPC) inefficiency as measured by the quantity channel equivalent of a theoretical plate (CETP), reflects t

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15

Wang, Yun-Feng. "The selection of rapid prototyping processes based on feature extraction from STL models." Thesis, Kingston University, 2000. http://eprints.kingston.ac.uk/20668/.

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Rapid Prototyping & Manufacturing has recently emerged as a new manufacturing technology that allows the rapid creation of three-dimensional models and prototypes. It automates the fabrication of solid objects directly from designs created by CAD systems, without part-specific tooling or human intervention. From visualising designs to generating production tooling, the Rapid Prototyping & Manufacturing gives the advantages needed in today's competitive environment. There are many different rapid prototyping systems available. This proliferation of rapid prototyping systems has, to some degree,

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16

Gál, Teodóra. "Cascade Valorization of Apple Pomace into Polyphenols and Pectins by Green Extraction Processes." Thesis, KTH, Glykovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289151.

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I det här projektet extraherades värdefulla komponenter från äpple-pomace som är en restprodukt från cidertillverkning. Restprodukten var tillhandahållen av en svensk cidertillverkare. Extraktionen fokuserades mot pektin och fenolföreningar som uppvisar antioxiderande aktivitet. Extraktionsprocessen designades ur ett miljövänligt perspektiv, inga skadliga kemikalier användes. Fenolära substanser extraherades initialt från pomacen med en vattenlösning innehållande 50% etanol. Därefter studerades kompositionen och den antioxiderande aktiviteten i dessa extrakt. Fokuseringen i projektet låg främs

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Miranda, Andreia Manuela Martins. "Novel processes for extraction and fractionation of fatty acids from microbial cell mass." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/34346.

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In this thesis a novel integrated process for extraction and fractionation of long chain polyunsaturated fatty acids (LC-PUFA), particularly the high-value docosahexaenoic acid (DHA), from wet microbial cell mass was investigated. The research was focused in two main aspects: (i) selection of enzymes for stepwise hydrolysis of triacylglycerols present the cell mass, and (ii) evaluation of a biphasic membrane contactor system, comprising an asymmetric membrane, for extraction of released fatty acids. The kinetics of hydrolysis of triacylglycerols to diacylglycerols, monoacylglycerols and free f

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18

Gordon, Ross John. "Improved mass transport efficiency in copper solvent extraction." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/5673.

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This thesis considers methods which can be employed to increase the mass of copper transferred into and out of the organic phase during the load and strip stages of commercial solvent extraction processes. Conventional 5-alkylsalicylaldoxime reagents transfer 1 mol of divalent copper per 2 mol of ligand in a neutral complex of the type [Cu(L-H)2] via a pH-swing process. New triacidic ligands have been designed which triple the molar transport of copper to form [Cu3(L-3H)2]. Until recently copper recovery by solvent extraction has been confined to oxidic ores which are leached with sulfuric aci

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Tipsrisukond, Narin. "Impact of lipid degradation processes, and supercritical carbon dioxide extraction on flavor characteristics of lard /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3091972.

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20

WANG, QUAN. "Development and evaluation of harvesting and lipid extraction processes for biodiesel production from microalgae." Kyoto University, 2020. http://hdl.handle.net/2433/259031.

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21

Lau, Wai-cho Ivan. "Removal of refractory chemicals in landfill leachate by UASB and advanced oxidation processes /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21527118.

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Ngoie, Mpinga Cleophace. "The extraction of precious metals from an alkaline cyanided medium by granular activated carbon." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71787.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: A 2 stage heap leach process to extract base and precious metals from the Platreef ore is currently being investigated industrially. A first stage bioleach is used to extract the base metals. In the 2nd stage, cyanide is used as the lixiviant at high pH to extract the platinum group metals and gold. By analogy with current gold recovery practices, the present study investigates the preferential and quantitative adsorption of precious metals (Pt, Pd, Rh and Au) over base metals (Cu, Ni and Fe) from an alkaline cyanide medium,

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23

Green, Caroline Elizabeth. "An experimental and modelling investigation into the solid-phase extraction of pollutants from water." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322408.

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劉偉藻 and Wai-cho Ivan Lau. "Removal of refractory chemicals in landfill leachate by UASB and advanced oxidation processes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31240471.

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25

Pavón, Regaña Sandra. "Rare earth elements recovery from E-wastes by solvent extraction and supported liquid membrane processes." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/671107.

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Nowadays, rare earth elements (REEs) have gained importance due to their indispensable and critical use in many high-tech industries like hybrid cars, fluorescent lamps, flat screen televisions, mobile phones, disc drives and wind turbines. Since these metals are needed to supply the required functionality in advanced technologies development and the lack of alternative materials, the REEs recovery from urban mining seems to be promising. Moreover, being the ores mines and their strip mining to REEs production placed in a few specific countries such as China, United States and Australia, the s

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26

Grundl, Gabriel [Verfasser], and Werner [Akademischer Betreuer] Kunz. "Influence of electrolytes on liquid-liquid equilibria for extraction processes / Gabriel Grundl ; Betreuer: Werner Kunz." Regensburg : Universitätsbibliothek Regensburg, 2021. http://d-nb.info/1228213178/34.

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Saber, Scott William. "Characteristic Analysis of Acid Mine Drainage Precipitates for the Optimization of Rare Earth Extraction Processes." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/97826.

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Acid mine drainage (AMD) forms when sulfur bearing rocks such as pyrite, are exposed to air and water. The oxidation of these minerals leads to the generation of sulfuric acid, which in turn mobilizes metals such as iron, aluminum, manganese, and others. If left untreated, AMD can cause severe harm to the surrounding ecosystem. By law, mining companies are required to treat AMD, often by oxidizing the contaminated water, raising the pH with a chemical additive, and precipitating the metals out of solution. Recent studies at West Virginia University and Virginia Tech have shown that AMD and

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Li, Chen. "Automatic extraction of behavioral patterns for elderly mobility and daily routine analysis." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/510.

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The elderly living in smart homes can have their daily movement recorded and analyzed. Given the fact that different elders can have their own living habits, a methodology that can automatically identify their daily activities and discover their daily routines will be useful for better elderly care and support. In this thesis research, we focus on developing data mining algorithms for automatic detection of behavioral patterns from the trajectory data of an individual for activity identification, daily routine discovery, and activity prediction. The key challenges for the human activity analys

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Lindh, Alice, and Pontus Blomberg. "Fibres from Reindeer Tendons : Mechanical and retting processes for extractning collagen fibres." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-26574.

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Collagen fibres from reindeer tendons can be used to create threads. These threads have traditionally been used in Sápmi crafts. Due to the high cost of manual extraction, tendon-based threads have been replaced with cheaper synthetic threads. However environmental concerns have been raised within the Sápmi crafts communities regarding the synthetic threads. To mitigate the impacts of synthetic threads and to better utilize the reindeer after slaughter a more efficient fibre extraction process has been sought after. In this study two venues have been investigated, softening and retting. In thi

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SOARES, PAULO S. M. "Estudo preliminar do fracionamento de terras raras medias e pesadas em grupos com extracao por solventes." reponame:Repositório Institucional do IPEN, 1994. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10353.

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Made available in DSpace on 2014-10-09T12:37:40Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:00:21Z (GMT). No. of bitstreams: 1 05345.pdf: 9869797 bytes, checksum: 233848268ca6b451d04e82fb4874216e (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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de, Oliveira Gonçalves Adriana. "Analysis of gold extraction processes of artisanal and small-scale gold minining In Portovelo-Zaruma, Ecuador." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58974.

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Artisanal and small-scale gold mining (ASGM) play a significant role in local economies and communities of several developing countries. Worldwide, ASGM is one of the biggest sources of mercury pollution. Every year, artisanal miners release approximately 727 tonnes per year of mercury to the environment. Globally, nearly 16 million people are directly or indirectly involved in ASGM activities using rudimentary techniques. Even though there are substantial potential socio-economic benefits of ASGM, it can be extremely damaging environmentally and often has serious health and safety consequence

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FAVARO, DEBORA I. T. "Estudo do comportamento de alguns lantanidios nas extracoes com misturas binarias de acido DI-(2-ETILHEXIL) fosforico (HDEHP) tenoiltrifluoroacetona." reponame:Repositório Institucional do IPEN, 1985. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9843.

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Negrete-Virgen, Juan Alejandro. "Manufacture of adenoviral vectors for gene therapy applications : critical comparison of solvent extraction and adsorption-based processes." Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288887.

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The biotechnology industry has recently been demanding nanoparticulate products (20-200 nm) such as viruses, plasmids, virus-like particles and drug delivery assemblies. These products are mainly used as gene delivery systems in gene therapy protocols. Adenoviral vectors {Ad) are the most exploited gene therapy vectors in industry worldwide. The :ma.nu.fu.cture of Ad fuces several problems including {i) small volumes of product per batch of cell culture, {ii) inaccurate, time consuming and multifuctor-dependant methods for infectivity determination and (iii) downstream processing. The downstre

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Siqueira, Silvia de. "Atividades biológicas de extratos de Solanum paludosum Moric. obtidos por maceração e extração supercrítica." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/60/60137/tde-07112010-222621/.

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Solanum paludosum Moric. popularmente conhecida como jurubeba roxa, é uma espécie arbustiva encontrada no Brasil, utilizada na medicina popular principalmente para tratar distúrbios do fígado. Embora alguns trabalhos tenham descrito o perfil fitoquímico de S. paludosum, não existem estudos, até o presente, avaliando as propriedades biológicas desta planta. Assim, dois procedimentos de extração, maceração e extração supercrítica foram utilizados para obter diferentes extratos desta planta. Estes extratos foram comparados no que diz respeito ao perfil cromatográfico dos seus compostos fenólicos

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Morales, Eduardo Vicentin. "Influência do fator de extração do café torrado e granulado e injeção de gás na formação de espuma no café solúvel tipo spray drier." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1062.

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O café é o segundo produto mais consumido no mundo, porém sua forma solúvel, ainda que muito prática, não possui boa aceitação no mercado brasileiro. Buscando estimular o seu consumo, este estudo teve como objetivo incrementar a formação de espuma no café solúvel tipo Spray Drier, submetido à variação do fator de extração e homogeneização do extrato com ar comprimido durante a secagem, além de avaliar a relação de carboidratos, proteínas e viscosidade do extrato com a formação de espuma. Os fatores de extração utilizados foram 3, 4 e 5 e a quantidade de gás foi limitada a 5NL.min-1. Foram aval

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Chou, Lin-Yi. "Improving the performance of Hierarchical Hidden Markov Models on Information Extraction tasks." The University of Waikato, 2006. http://adt.waikato.ac.nz/public/adt-uow20070212.152608/index.html.

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Patil, Rahul. "Membrane Processes for Sustainable Energy Applications." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1353077392.

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Lundstedt, Staffan. "Analysis of PAHs and their transformations products in contaminated soil and remedial processes." Doctoral thesis, Umeå universitet, Kemi, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-57.

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Soil that is heavily contaminated with polycyclic aromatic hydrocarbons (PAHs) is often found at the sites of former gasworks and wood-impregnation plants. Since PAHs are toxic these sites represent a hazard to human health and the environment, and therefore they need to be treated, preferably by a method that destroys the contaminants, and thus eliminates the problem permanently. However, during biological and chemical degradation of PAHs other toxic compounds may be formed. If these transformation products are sufficiently persistent they could potentially accumulate during remedial processe

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Castellano, Simone. "Multiscale study and modeling of dispersion properties relevant for liquid-liquid extraction : adaptation of breakup and coalescence kernels to industrial processes." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1243.

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Ce projet de thèse porte sur l'étude de l'hydrodynamique des dispersions dans les extracteurs liquide-liquide utilisés dans l'industrie du recyclage nucléaire. Dans la première partie du projet, un modèle de bilan de population homogène (0D-PBM), basé sur l'évaluation des taux moyens en volume de coalescence et de rupture, est proposé. La méthode tient compte des inhomogénéités spatiales dans le mélange, notamment de la fonction de densité de probabilité de la dissipation de l’énergie cinétique turbulente dans l’appareil. Le modèle est capable de reproduire les expériences de dispersion liquid

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Gooch, P. "A modular, open-source information extraction framework for identifying clinical concepts and processes of care in clinical narratives." Thesis, City University London, 2012. http://openaccess.city.ac.uk/2112/.

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In this thesis, a synthesis is presented of the knowledge models required by clinical informa- tion systems that provide decision support for longitudinal processes of care. Qualitative research techniques and thematic analysis are novelly applied to a systematic review of the literature on the challenges in implementing such systems, leading to the development of an original conceptual framework. The thesis demonstrates how these process-oriented systems make use of a knowledge base derived from workflow models and clinical guidelines, and argues that one of the major barriers to implementati

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Wimmer, Tristan [Verfasser], and Michael [Akademischer Betreuer] Scholz. "Information in Online Purchase Decision Processes: Information Extraction, Data Analysis and Economic Impact / Tristan Wimmer ; Betreuer: Michael Scholz." Passau : Universität Passau, 2019. http://d-nb.info/1188463926/34.

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Font, Morales Laura. "Melt inclusions from the Southwest Indian Ridge and Reykjanes Ridge : insights into melt extraction and magma chamber processes." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274582.

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Wimmer, Tristan Verfasser], and Michael [Akademischer Betreuer] [Scholz. "Information in Online Purchase Decision Processes: Information Extraction, Data Analysis and Economic Impact / Tristan Wimmer ; Betreuer: Michael Scholz." Passau : Universität Passau, 2019. http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-6327.

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SILVA, Sabrina Roberta Santana da. "Produção de pigmentos carotenóides por Rhodotorula spp. em fermentação submersa utilizando glicerina residual." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17940.

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Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2016-10-04T19:18:31Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação_Sabrina_Concluída 22.04.15_Corrigido_VERSÃO FINAL sem assinaturas_com ficha catalografica_com menção de APROV~1.pdf: 1129690 bytes, checksum: 50a74fb8c1db07ca01d5877c4b969206 (MD5)<br>Made available in DSpace on 2016-10-04T19:18:31Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação_Sabrina_Concluída 22.04.15_Corrigido_VERSÃO FINAL sem assinatura

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Smith, Paul Devon. "An Analog Architecture for Auditory Feature Extraction and Recognition." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4839.

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Speech recognition systems have been implemented using a wide range of signal processing techniques including neuromorphic/biological inspired and Digital Signal Processing techniques. Neuromorphic/biologically inspired techniques, such as silicon cochlea models, are based on fairly simple yet highly parallel computation and/or computational units. While the area of digital signal processing (DSP) is based on block transforms and statistical or error minimization methods. Essential to each of these techniques is the first stage of extracting meaningful information from the speech signal, whi

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ZARPELON, LIA M. C. "Contribuicao ao estudo da separacao zirconio/hafnio no sistema MIBK-HSCN-HCL." reponame:Repositório Institucional do IPEN, 1995. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10423.

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Made available in DSpace on 2014-10-09T12:38:32Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:04:40Z (GMT). No. of bitstreams: 1 06010.pdf: 10090735 bytes, checksum: 27ba3c575e2c6be05736a4e1e736812a (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Turkington, 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.

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This thesis involves the design and development of reagents for the recovery of base metals (specifically zinc, nickel and cobalt) in hydrometallurgical solvent extraction processes. The work aims to demonstrate how ligand design can affectively tune the strength and selectivity of extractants to achieve efficient recovery of the desired base metals. Chapter 1 reviews current solvent extraction processes used in extractive metallurgy, encompassing both the well established technologies developed for sulfate streams as well as those more recently explored for treating chloride streams. Also rev

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Betton, Clélia. "Nouvelle stratégie d'extraction et de purification de l'hydrazine N2H4 de grade spatial via le procédé Raschig : synthèse, modélisations cinétiques, équilibres entre phases et schémas de procédé." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10366/document.

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Ce travail, effectué dans le cadre d’un financement CIBLE-Région Rhône-Alpes, en partenariat avec le groupe HERAKLES-SAFRAN, a pour objectif la mise au point d’un nouveau procédé d’extraction et de purification de l’hydrazine N2H4, pour des applications spatiales. Ce monergol se doit d'être de très haute pureté, avec une composition massique supérieure à 99,5 % en hydrazine et un taux en carbone inférieur à 30 ppm. La première partie de cette étude nous a permis d’identifier les réactions de formation et de dégradation en vue d’établir un modèle cinétique global et de déterminer les paramètres

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Karjalainen, S. M. (Satu Maaria). "Identification of processes leading to long-term wastewater purification in northern treatment wetlands." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212777.

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Abstract Treatment wetlands (TW) constructed on natural wetlands potentially perform efficient purification of wastewater, but the longevity of TWs at northern latitudes is not well known. This thesis examined processes affecting nutrient and suspended solids (SS) retention in TWs during their lifetime. In total, 15 TWs were studied using water and peat quality and gas flux data for different TW life lengths, the longest period being 18 years. The TWs commonly retained nutrients and suspended solids efficiently, even after 18 years of wastewater loading. For nitrogen (N) removal, sedimentation

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Ramirez, Cadavid David A. "Development of Processes for the Extraction of Industrial Grade Rubber and Co-Products from the Roots of Taraxacum kok-saghyz (TK)." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1512060296142347.

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