Dissertations / Theses on the topic 'Ba14'
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Haynes, Richard. "The safety, tolerability and biochemical efficacy of extended release niacin and laropiprant in a major randomised clinical trial." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:01ba360a-fe6a-4a1a-ba14-48a2dcc3e0dd.
Full textLemoine, Marie-Pierre. "Coopération hommes-machines dans les procédés complexes : Modèles techniques et cognitifs pour le contrôle de trafic aérien." Valenciennes, 1998. https://ged.uphf.fr/nuxeo/site/esupversions/0821b192-7376-49d6-ba14-abc99ab0917a.
Full textCasellas-Français, Magali. "Mise en oeuvre, modélisation, optimisation et contrôle d'un procédé discontinu séquentiel (SBR) : application au traitement du carbone, de l'azote, du phosphore et des matières en suspension d'eaux résiduaires urbaines." Limoges, 2002. https://aurore.unilim.fr/theses/nxfile/default/c7b8b1be-7f59-4700-ba14-86cff384c513/blobholder:0/2002LIMO0035.pdf.
Full textWastewater treatment optimization requires the installation of reliable processes and a control of operating conditions. In this context, discontinuous processes like SBR, working on the principle of alternating reaction, settling and purge phases is investigated. A development process methodology based on the use of mathematical simulations, lab scale experiments, full scale extrapolation and simple but robust control strategies is reported. The Benchmark of wastewater treatment associates a wastewater treatment model (ASM n°1 ofHENZE et al. , 1986) and a settling conditions model (TACKACS et al. , 1991). Combining both models allows for the simulation of an activated sludge process operation. An exhaustive bibliographic study could highlight different scenarios of SBR operations able to achieve carbon, nitrogen, phosphorus and total suspended solids removal. Different time delays were investigated in order to identify two particular operating conditions : short cycles and long cycles. The use of the Benchmark associated with a critical identification of incoming variables of the model, was extended to the development of strategies for nitrogen removal improvement. This study, combined with an experimental study of phosphorus removal allowed to define a 24 hours cycle, improving denitrification rates but also highlighting problems related to temporal variations of incoming load. In order to solve this problem, a special procedure , based on the use of three sensors : pH, ORP, dissolved oxygen, was investigated and full scale commissioned, in order to control with accuracy operating conditions
Santelli, Claudio. "Accelerating multi-dimensional magnetic resonance imaging of blood flow and turbulence in the cardiovascular system." Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/accelerating-multidimensional-magnetic-resonance-imaging-of-blood-flow-and-turbulence-in-the-cardiovascular-system(8a415f79-2e07-48fd-ba14-13eab607da22).html.
Full textRodrigues, João Elias Figueiredo Soares. "Ordenamento e propriedades dielétricas em microondas dos sistemas (Ba1-xSrx)3CaNb2O9 e (Ba1-yLay)3Ca1+yNb2-yO9." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-15092017-081825/.
Full textDielectric materials for microwave applications play an important role in mobile and satellite communication systems, including terrestrial monitoring, internet/mobile devices, internet of things, as well as the military uses as the radar developments. Advances in this technological field were only possible due to the ostensive use of dielectric resonators (DRs). These devices constitute oxide ceramics with a low dielectric loss in microwave frequency. The system must have high dielectric constant and such a device must be thermally stable. The search for highperformance materials granted the discovery of 1:1 and 1:2 ordered perovskites, with general formula A2BBO6 and A3BB2O9, respectively. These systems depict the B-site ordering of ABO3 perovskite, inducing the crystalline planes stacking in the [1 1 1]c direction. The literature results showed that the ordering plays an essential role in the low loss ceramics. Moreover, few studies reported the features of the systems containing the Ca and Nb cations at the B-site. Therefore, our work drives the dielectric properties of the Ba3CaNb2O9 system and, then, the modification induced by Ba2+ substitution by Sr2+ and La3+. The samples were prepared by the conventional solid-state reaction method and probed by X-ray diffraction, Raman scattering, impedance spectroscopy and microwave performance, as well as other techniques such as thermal analysis, density measurement, and electron microscopy. Our findings elucidated the coexistence of 1:1 and 1:2 domains in Ba3CaNb2O9 ceramics, being possible to manipulate them by sintering conditions. Such an ordered domain denotes regions in the crystallites with different cationic order and with different crystallographic and vibrational behavior. By the impedance spectroscopy, it was observed that Ba3CaNb2O9 ceramics tend to conduct more when they present a tendency towards the 1:1 domains. The earlier result was also confirmed in microwave frequency, in which the dielectric loss decreasing was correlated to the decrease of the 1:1 domain in the crystal structure. In the strontium solid solution, a transition from the D3d3 trigonal phase to the C2h3 monoclinic one was noted in powder samples, being derived from octahedral tilting (a0b-b- Glazer system). In the lanthanum system, besides the coexistence, the monodomains 1:1 and 1:2 were observed. Otherwise, the 1:1 monodomain system, BaLaCaNbO6 (y = 0.50), exhibited an intrinsic monoclinic distortion. This distortion was ascribed to the octahedral tilting (a0b-b- Glazer system), lowering the crystal symmetry from Oh5 cubic phase to the C2h3 monoclinic phase. The dielectric resonator performances of the BaLaCaNbO6 and Ba3CaNb2O9 systems were evaluated. The first system showed the following values: permittivity εg ∼ 26, Qu × fR ∼ 10.506 GHz and coefficient τf ∼ -55 ppm.K-1. The second system exhibited the data: permittivity εg ∼ 43, Qu × fR ∼ 15.752 GHz and coefficient τf ∼ 278 ppm.K-1.
Nogueira, Içamira Costa. "Fotoluminescência dos compostos (Ba1-xSrx)MoO4 sintetizados com diferentes solventes." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/715.
Full textUniversidade Federal de Sao Carlos
The molybdates with scheelite-type tetragonal structure is a family of inorganic materials that has received considerable attention since the discovery of their luminescent properties, with emission in the visible spectral region. In this work, barium strontium molybdate crystals, (Ba1-xSrx)MoO4, with the compositions (x = 0, 0.25, 0.50, 0.75 and 1) were synthesized by co-precipitation method (drop by drop) in the presence of various solvents (water, 1,4-butanediol and diethylene glycol butyl ether) . The crystals obtained were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, M- Raman spectroscopy (M- Raman) and Fourier transform infrared (FT -IR) spectroscopy. The shape and size of the crystals were observed by means of field emission scanning electron microscopy (FE -SEM). The optical properties were investigated by ultraviolet-visible (UV Vis) absorption spectroscopy and photoluminescence (PL) measurements. The XRD patterns, M- Raman and FT- IR spectra showed that all crystals are monophasic with a scheelite-type tetragonal structure, belonging to the space group I41/a. The lattice parameters and atomic positions obtained by Rietveld refinement were employed to molding [BaO8], [SrO8] and [MoO4] clusters into the tetragonal lattice. The microscopy images showed that (Ba1-xSrx)MoO4 crystals with different concentrations (x) and synthesized with different solvents showed changes in size (micro and nanocrystals) and the shape (octahedron, flowers, balls and rods) crystals. Photoluminescent emission at room temperature in different regions of maximum intensity was assigned to different densities of intermediate electron levels (deep and shallow) located within the band gap as a consequence of the degree of order-disorder structural in the crystal lattice and defects on the surface of crystals. Finally, we discussed possible mechanisms to explain the behavior photoluminescent.
Os molibdatos com estrutura tetragonal tipo scheelita é uma família de materiais inorgânicos que tem recebido considerável atenção desde a descoberta de suas propriedades luminescentes, com emissões na região espectral do visível. Neste trabalho, cristais de molibdatos de bário e estrôncio, (Ba1-xSrx)MoO4, com as composições (x = 0; 0,25; 0,50; 0,75 e 1) foram sintetizados pelo método de co-precipitação (gota a gota) na presença de diversos solventes (água, 1,4-Butanodiol e dietilenoglicol butil éter). Os cristais obtidos foram estruturalmente caracterizados por difração de raios X (DRX), refinamento de Rietveld, espectroscopia M-Raman (M-Raman) e espectroscopia no infravermelho com transformada de Fourier (FT-IV). A forma e tamanho dos cristais foram observados por intermédio da microscopia eletrônica de varredura por emissão de campo (FE-SEM). As propriedades ópticas foram investigadas por espectroscopia de absorção no ultravioleta e visível (UV-Vis) e medidas de fotoluminescência (FL). Os padrões de DRX, os espectros de M-Raman e FT-IV mostraram que todos os cristais são monofásicos com estrutura tetragonal tipo scheelita, pertencentes ao grupo espacial I41/a. Os parâmetros de rede e posições atômicas obtidos pelo Refinamento de Rietveld foram empregados para modelar os clusters [BaO8], [SrO8] e [MoO4] dentro da rede cristalina tetragonal. As imagens de microscopia indicaram que os cristais de (Ba1-xSrx)MoO4 com diferentes concentrações (x) e sintetizados com diferentes solventes apresentou modificações no tamanho (micro e nanocristais) e na forma (octaedros, flores, bastões e esferas) dos cristais. As emissões fotoluminescentes a temperatura ambiente em diferentes regiões de intensidade máxima, foi atribuída a diferentes densidades de níveis eletrônicos intermediários (rasos e profundos) localizados dentro do band gap, como consequência do grau de ordem-desordem estrutural na rede cristalina e defeitos nas superfícies dos cristais. Finalmente, foram discutidos possíveis mecanismos para explicar o comportamento fotoluminescente.
Carey, Joseph Vincent. "New bisphosphine ligands for asymmetric catalysis." Thesis, University of Oxford, 1991. http://ora.ox.ac.uk/objects/uuid:c1261e8d-baf4-476a-8954-f943588e1579.
Full textTzeng, Shih-jung. "From Hōnto Jin to Bensheng Ren : the origin and development of Taiwanese national consciousness : based on the examination of two diaries (1920-1955)." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:d095ffe8-3cdc-44ad-ba15-6b31d16d7464.
Full textHumphreys, Adam Richard Copeland. "Kenneth Waltz and the limits of explanatory theory in international relations." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:d21f41ff-ba18-453f-ba70-ecb7bf8ec3db.
Full textRidlehoover, Nathan. "The Sermon's Prayer : an examination of the intended purpose of the Matthean model prayer." Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/76b3396f-6879-4c5d-ba54-c303e9bd2088.
Full textDengate, Jacob. "Lighting the torch of liberty : the French Revolution and Chartist political culture, 1838-1852." Thesis, Aberystwyth University, 2017. http://hdl.handle.net/2160/eee3b4b8-ba1e-48bd-848e-26391b96af26.
Full textKumar, Chandra Bhushan. "Hydrological politics in megacity : rethinking water governance in Delhi." Thesis, Aberystwyth University, 2013. http://hdl.handle.net/2160/315aebfb-2b31-42cc-ba74-31e3787902cf.
Full textMacKinnon, Robert James. "Affective geographies of models and modelling." Thesis, Aberystwyth University, 2016. http://hdl.handle.net/2160/3bddf5c3-52b9-428b-ba10-4b0384b4b6b2.
Full textWoods, Bernadette. "An exploration of substitutes' experiences in football." Thesis, Aberystwyth University, 2007. http://hdl.handle.net/2160/3df9a184-4ff3-410c-ba1a-0b9188468136.
Full textKeogh, Mary. "Energy and regional power in advanced developing states : a Turkish case study." Thesis, Aberystwyth University, 2018. http://hdl.handle.net/2160/cbafba78-fa5c-4993-ba17-fa1f460dc276.
Full textSkandalis, Ioannis. "Balancing employer and employee iterests : legitimate expectations and proportionality under the Acquired Rights Directive." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:a081fee6-ba74-42dc-a894-2e23a9e0a210.
Full textBarkus, Christopher. "Studies of emotionality in genetic mouse models of altered glutamate or 5-HT function." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:c144d0d0-ba1f-4127-b07a-372e6abf569b.
Full textLakner, Christoph. "The determinants of incomes and inequality : evidence from poor and rich countries." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:dbfaef0e-a195-46f3-ba12-db5d3a8bf035.
Full textvon, Billerbeck Sarah Birgitta Kanafani. "Whose peace? : local ownership and UN peacebuilding." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:b6c84aa3-5344-48d8-ba1a-2b01d1a75146.
Full textHamilton, Alexander Graham. "The Arts & Crafts in church-building in Britain, 1884-1918." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:e51d8f96-ba74-4655-b290-b95107f88770.
Full textAbraham, Adam. "Spurious Victorians : imitation and the nineteenth-century novel." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:cbf24b85-cc63-42be-ba84-2f065942c4d8.
Full textMcCann, Benjamin Edward. "Set design, spatial configurations and the architectonics of 1930s French poetic realist cinema." Thesis, University of Bristol, 2002. http://hdl.handle.net/1983/c99b13b0-9aca-425b-ba16-4ce97d9c643f.
Full textRiby, Leigh Martin. "The effects of age, task complexity and task domain on dual task performance." Thesis, University of Bristol, 2002. http://hdl.handle.net/1983/af3ecd46-ba64-48c3-a8f7-7fd30df39fad.
Full textRees, Kathryn Tara. "Behavioural study of the deposition and removal of cross-linked PDMS droplets on macroscopic surfaces." Thesis, University of Bristol, 2005. http://hdl.handle.net/1983/16eac45f-bec4-46ec-ba1d-92c75443c028.
Full textCottee, Matthew A. "Building the Drosophila centriole : a structural investigation of the centriolar Proteins SAS-6, SAS-4 and Ana2." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:b43c6848-56bd-4806-ba34-ed2cde59b294.
Full textSengupta, Arghya. "Independence and accountability of the Indian higher judiciary." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:d16c344d-ba44-454f-9606-456b8524071e.
Full textXu, Yiming. "Angle-resolved Photoemission Studies on Hole Doped Iron Pnictides Ba1-xKxFe2As2." Thesis, Boston College, 2010. http://hdl.handle.net/2345/1417.
Full textThesis advisor: Ziqiang Wang
The discovery of the high-Tc superconductivity in iron-arsenic materials in 2008 immediately became one of the hottest topics in the condensed matter physics. This dissertation presents a systematic study on the pairing symmetry and electronic structure on the hole doped materials of BaFe2As2 (so called “122”-system), by angle-resolved photoemission spectroscopy (ARPES). In the early ARPES studies on “122”-pnictides, we observed two hole-like Fermi surfaces (FSs) centered at the Brillouin zone (BZ) center, (Γ), and two electron-like FSs centered at the zone corner (M), which is (π, π) in the BZ or (π, 0) in the unfolded BZ. The size of these FS sheets can be changed by carrier doping, which causes change of the chemical potential. In the superconducting state, temperature (T) and momentum (k) dependence of ARPES measurements reveals the Fermi-surface-dependent nodeless superconducting gaps in this system and shows that an s-wave symmetry is the most natural interpretation for our findings in terms of the pairing order parameter. The ratio 2Δ/kBTc switches from weak to strong coupling on different FS sheets. Large superconducting gaps are observed with a strong coupling coefficient (2Δ/kBTc) on the near-nested FSs connected by the antiferromagnetic (AF) wave vector ((π, π) in the BZ or (π, 0) in the unfolded BZ). When Tc is suppressed in the heavily overdoped materials, the near-nesting condition vanishes, or more precisely, the (π, π) inter-FS scattering disappears due to the absence of either the hole-like or the electron-like FS at the Fermi energy (EF). We have also performed ARPES measurements on kz-dependence of the superconducting gap and band structure of the optimally hole doped sample Ba0.6K0.4Fe2As2. By varying the photon energy, we can tune kz continuously. While significant kz dispersion of the superconducting gaps is observed on the hole-like bands, much weaker kz dispersion of the superconducting gaps is observed on the electron-like bands. Remarkably, we find that a 3D gap function based on short-range pairing can fit the superconducting gaps on all the FS sheets. Moreover, an additional hole-like FS (referred as the α‘ FS) predicted by local density approximation (LDA) calculations is observed around the Z point. The disappearance of intensity of the α‘ band near EF at kz = π/2 suggests that the α‘ band could either sink below EF or be degenerate with the inner hole (α) band. The studies on the α‘ band in the superconducting state reveal a nearly isotropic superconducting gap on this FS sheet. Underdoped samples Ba0.75K0.25Fe2As2 are used to study how the AF fluctuations and superconductivity interplay in the underdoped regime that is closer to the AF phase. we observe that the superconducting gap of the underdoped pnictides scales linearly with Tc. A distinct pseudogap develops upon underdoping and coexists with the superconducting gap. Remarkably, this pseudogap occurs mainly on the FS sheets that are connected by the AF wave vector, where the superconducting pairing is stronger as well. This suggests that both the pseudogap and the superconducting gap are driven by the AF fluctuations, and the long-range AF ordering competes with the superconductivity. The observed dichotomic behaviour of the pseudogap and the SC gap on different FS sheets in the underdoped pnictides shares similarities with those observed in the underdoped copper oxide superconductors, providing a possible unifying picture for both families of high-temperature superconductors
Thesis (PhD) — Boston College, 2010
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics
Du, Chao-Hung. "X-ray scattering studies of CDW modulated structures in Ba1-xKxBiO3." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/13726.
Full textWillis, Roxana. "Justice for the poor or poorer justice? : an investigation of the 'dangers of community' in restorative justice through a class-focused lens." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:75d6355f-8c65-4f7a-ba1c-ca713dea5662.
Full textWeichbrodt, Conrad. "Elektrophysiologische Charakterisierung des mitochondrialen Porins VDAC1 und des antimikrobiellen Peptids Dermcidin in lösungsmittelfreien Modellmembranen." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://hdl.handle.net/11858/00-1735-0000-0001-BAA4-C.
Full textBailey, Nigel J. "ANSA bridged metallocene chemistry of niobium." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:9bd76a85-ba44-42d8-affe-317bc98be368.
Full textBaboulene, David. "Knowledge gaps in popular Hollywood cinema storytelling : the role of information disparity in film narrative." Thesis, University of Brighton, 2017. https://research.brighton.ac.uk/en/studentTheses/e701604b-ba17-411d-b356-aebcd45f97b8.
Full textSimaitis, Aistis. "Automatic verification of competitive stochastic systems." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:68b5e2d8-ba04-419f-8926-4cd542121e2d.
Full textCox, Peter John. "The effects of a novel substrate on exercise energetics in elite athletes." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:7aa52ece-42e1-4ebc-ba1c-727ba1f95cb8.
Full textLloyd, Robin Jonathan. "Fabrication, testing and modelling of palladium membranes for fuel cell applications." Thesis, University of Oxford, 2004. http://ora.ox.ac.uk/objects/uuid:8732ee9a-baf4-40b4-8c42-52b5eab7b944.
Full textMoss, Jennifer. "Identification and characterisation of homologous recombination genes in Schizosaccharomyces pombe." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:3f2f12d1-64b9-496a-ba1e-5c464e89c7b7.
Full textMcCulloch, Trish. "Criminal justice sanctions and services : exploring potential." Thesis, University of Dundee, 2014. https://discovery.dundee.ac.uk/en/studentTheses/408a1804-4476-4fc0-ba19-9c05b44551fe.
Full textRigby, Alexandra. "Magnetic effects in astrophysically relevant laboratory plasmas." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:77d2ca16-6aaf-4051-ba41-85cada136f1b.
Full textWhitcombe, Michael James. "Red-sensitive imaging systems for holography." Thesis, Royal Holloway, University of London, 1987. http://repository.royalholloway.ac.uk/items/93c5198a-27d2-4c1d-ba1b-744bdc04fac0/1/.
Full textCoomber, Neil. "The performative construction of identity in the Shang and Zhou dynasties." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:574e9a33-55d8-4d30-ba34-feae0ef9cdf2.
Full textNeil, Howard. "'It's easier if we stop them moving' : a critical analysis of anti-child trafficking discourse, policy and practice : the case of southern Benin." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:11094e72-496e-4b99-ba15-6b19e6efc490.
Full textZimdars, Anna. "Challenges to meritocracy? : a study of the social mechanisms in student selection and attainment at the University of Oxford." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:0e9cf555-a921-4134-baf4-ce7114795f36.
Full textBish, Nigel B. "Dielectric condition monitoring using intelligent partial discharge analysis." Thesis, University of Brighton, 2003. https://research.brighton.ac.uk/en/studentTheses/5dfeb20c-6066-41b8-ba10-59ae9a7877af.
Full textWiesenmayer, Josef Erwin. "Interplay of superconductivity and magnetism in Ba1-xKxFe2As2 and its potential as wire material." Diss., Ludwig-Maximilians-Universität München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:19-185090.
Full textKing, V. "I and we : towards an understanding of collaborative educational research contribution." Thesis, Coventry University, 2013. http://curve.coventry.ac.uk/open/items/648213ba-696d-4231-ba12-d350e03ba9bb/1.
Full textAljasir, Shuaa Abdulrahman. "An investigation of Facebook usage by university students in Saudi Arabia." Thesis, Coventry University, 2015. http://curve.coventry.ac.uk/open/items/088175cb-851b-4fc3-ba41-dd61591f04d9/1.
Full textLeroy, Floriane. "Etude des propriétés électro-optiques des couches minces de Ba1-xSrxTiO3 pour la modulation optique." Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2012. http://tel.archives-ouvertes.fr/tel-00749716.
Full textVan, Bloemenstein Chantell Berenice. "Petrographic characterization of sandstones in borehole E-BA1, Block 9, Bredasdorp Basin, Off-Shore South Africa." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5957_1189147269.
Full textThe reservoir quality (RQ) of well E-BA1 was characterized using thin sections and core samples in a petrographic study. Well E-BA1 is situated in the Bredasdorp Basin, which forms part of the Outeniqua Basin situated in the Southern Afircan offshore region. Rifting as a result of the break up of Gondwanaland formed the Outeniqua Basin. The Bredasorp Basin is characterized by half-graben structures comprised of Upper Jurassic, Lower Cretaceous and Cenozoic rift to drift strata. The current research within the thesis has indicated that well E-BA1 is one of moderate to good quality having a gas-condensate component.
Licheron, Marina. "(ba1-xkx)2(pb1-ybiy)o4 : une nouvelle famille d'oxydes supraconducteurs bi-dimensionnels sans ioin magnetique." Orléans, 1992. http://www.theses.fr/1992ORLE2024.
Full textHelifa, Bachir. "Contribution à la simulation du CND par courants de Foucault en vue de la caractérisation des fissures débouchantes." Nantes, 2012. http://archive.bu.univ-nantes.fr/pollux/show.action?id=4d9f6caf-4c86-49ca-ba1b-9b4aeca65049.
Full textThe work of the present thesis falls within the field of Non Destructive Testing (NDT) by eddy current (EC) in its experimental and modeling aspects. Its main purpose is the development of an evaluation strategy and the elaboration of software and hardware tools for better analysis of signals from an eddy current sensor for the characterization of surface cracks in "critical" parts of conducting materials. It fits into the general framework for the characterization of cracks by eddy currents. In this context and in order to place the work in a more general framework, we consider cracks containing material that unidentified electrical conductivity and (or) magnetic permeability with an unknown coating thickness. Direct models in 2D and 3D finite element magnetodynamic formulation using magnetic vector and electric scalar potentials deduced from Maxwell equations are developed for modeling the system (material + crack + coil). Simplex and neural networks algorithms are developed for solving the inverse problem in order to obtain a complete characterization of the surface crack. We validate the developed models (direct and reverse) by comparing data obtained from a set of laboratory experiments, using known coils and standard parts with clearly identified cracks, which allows the determination of the morphology of the surface crack : position, shape and dimensions. Finally, and based on the developed approaches, we establish a control strategy for a complete characterization of surface cracks