Dissertationen zum Thema „Test des défauts de fabrication“
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Welter, Loïc. „Contribution à l'amélioration de l'observabilité et de la reproductibilité des défauts dans les dispositifs semi-conducteurs“. Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4776.
Der volle Inhalt der QuelleRecurrent defects appearing in specific contexts have a significant impact on nanoscale technology nodes manufacturing process yield. Therefore, a new in-situ process monitoring method is developed to improve the overall performance of the production tool. It is complementary to classical failure analysis techniques, especially when a yield crisis occurs. The idea is to transform a production circuit into a test vehicle by reusing its components. The circuit loses its original functionality in favor of process monitoring functions, carried out only with standard cells widely available in circuits. This transformation, called "topological exchange" involves modifying some levels of metallization and requires the creation of a particular design flow, based on Engineering Change Order (ECO) techniques. As several functions must be able to cohabit on the same vehicle, a multiplexing system is evaluated. Feasibility is shown through a test circuit designed analogously to a production circuit. It is transformed for the example into an integrated dielectric thickness control system
Bichebois, Pascal. „Méthodes pour améliorer les rendements grace aux techniques de controle des défauts sur plaquettes en cours de fabrication“. Grenoble INPG, 1998. http://www.theses.fr/1998INPG0028.
Der volle Inhalt der QuelleNasreddine, Bassam. „Conception d'une mémoire reconfigurable intégrée sur tranche“. Phd thesis, Grenoble INPG, 1988. http://tel.archives-ouvertes.fr/tel-00327331.
Der volle Inhalt der Quelle-à étudier la faisabilité de cette mémoire
-à définir l'architecture d'une telle mémoire en tenant compte du rendement
-à définir une stratégie de test pour l'ensemble du circuit
-à étudier les dispositifs de connexion/déconnexion qui permettront de réaliser physiquement la mémoire finale -à développer des algorithmes de configuration qui détermineront les groupes de cellules en paquets de 256kbits.
Ce travail a été réalisé dans le cadre du projet Esprit-824. Un premier essai de fabrication a permis de caractériser les dispositifs de connexion. La mémoire de 4.5 mbits a été envoyée en fabrication fin 1987
Alachkar, Bassem. „Diagnostic vibro-acoustique des défauts de fabrication des machines électriques“. Paris 11, 1995. http://www.theses.fr/1995PA112190.
Der volle Inhalt der QuelleAyadi, Badreddine. „Simulation et quantification tridimensionnelledes défauts générés par un processus de fabrication“. Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00466985.
Der volle Inhalt der QuelleAndreau, Olivier. „Nocivité en fatigue et contrôle de défauts produits par fabrication additive“. Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0037.
Der volle Inhalt der QuelleThe Selective Laser Melting Process (SLM) consists in manufacturing metallic parts by melting successive powders layers. This new additive manufacturing method allows building new complex geometries that can help lighten structures, such as lattice parts. However, the mechanical properties of additive manufacturing parts are still an industrial concern, especially for high cycle fatigue behavior. Such parts can indeed comprise surface and internal pores that can be deleterious to mechanical properties. The goal of this thesis is to characterize the influence of porous defects on the high cycle fatigue fatigue performance of 316L SLM parts. Firstly, some key SLM parameters that can control the porosity and the microstructure of fabricated parts were quantified. A distinction between the pore types was proposed, and their characteristics were related to the volumetric energy density delivered by the laser. The microstructure was also investigated, with a focus on crystallographic orientation and grain size, depending on the melt pool overlap and morphology. Secondly, using X-ray tomography, a parametric research was conducted to generate and characterize optimized fatigue samples with a minimal amount of pores. Such samples were used as a reference for other fatigue samples containing various randomly distributed pore populations, with similar microstructures. The relative influence of different internal pore populations on the high cycle fatigue endurance was quantified, for similar surface pore population. Finally, deterministic pores with controlled morphology, position and various dimensions were generated after a detailed parametric optimization. A specific internal crack initiation threshold was evidenced for deterministic defects, which was supposed to be linked to the local gaseous environment during crack initiation and propagation
Ayadi, Badreddine. „Simulation et quantification tridimensionnelle des défauts générés par un processus de fabrication“. Cachan, Ecole normale supérieure, 2009. http://tel.archives-ouvertes.fr/tel-00466985/fr/.
Der volle Inhalt der QuelleThe manufacturing dimensioning intends to determine the intermediary geometrical and dimensional state of the part during its manufacturing process. This manufacturing dimension also permits to respect the functional requirements given by the design drawing on one hand, and the manufacturing constraints on the other (the machine precision, minimal machining extra thickness. . . ). The TMT method (Three-dimensional Manufacturing Tolerancing) is a three-dimensional approach of manufacturing dimensioning with the concept of small displacements torsor. This approach permits to treat the specification to definition drawing defined by the ISO norms. The purpose is to analyse the impact of the manufacturing deviations on each specification to be considered. This method uses a precise definition of the reference systems in each phase in correlation with the machine adjustment process. The nominal part model is directly fixtured on the datum system of the studied requirement so as to minimize the number of the unknowns. This approach puts into evidence the obtained calculation simplifications, which permits a simple writing of the dimensions chains resultant to verify each requirement
Patry, Jean-Luc. „Intégration sur tranche d'une architecture massivement parallèle tolérant les défauts de fin de fabrication“. Phd thesis, Grenoble INPG, 1992. http://tel.archives-ouvertes.fr/tel-00341630.
Der volle Inhalt der QuelleHouarche, Nicolas. „Modélisation de défauts paramétriques en vue de tests statiques et dynamiques“. Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2009. http://tel.archives-ouvertes.fr/tel-00481534.
Der volle Inhalt der QuelleDerème, Tristan. „Test en tension des courts-circuits en technologie CMOS“. Montpellier 2, 1995. http://www.theses.fr/1995MON20032.
Der volle Inhalt der QuellePires, David. „Vers une matérialisation des défauts topologiques d'un cristal liquide nématique“. Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/PIRES_David_2006.pdf.
Der volle Inhalt der QuelleHouarche, Nicolas. „Modélisation de défauts paramétriques en vue de tests statiques et dynamiques“. Phd thesis, Montpellier 2, 2009. http://www.theses.fr/2009MON20248.
Der volle Inhalt der QuelleAndriamanantena, Vonjinirina. „Analyse du comportement mécanique de composites en fonction des défauts de structure générés par les conditions de fabrication“. Lille 1, 1997. http://www.theses.fr/1997LIL10206.
Der volle Inhalt der QuelleQuackenbush, John Charles. „Design, fabrication and test of a gas turbine engine and wave rotor test bed“. Diss., Connect to online resource - MSU authorized users, 2008.
Den vollen Inhalt der Quelle findenSimonin, Bertrand. „Détection et localisation de défauts dans les circuits intégrés logiques par test sous faisceau laser“. Bordeaux 1, 1988. http://www.theses.fr/1988BOR10591.
Der volle Inhalt der QuelleForli, Lionel. „Test et diagnostic de défauts dans les interconnexions métalliques des circuits numériques par infrastructures "IP"“. Aix-Marseille 1, 2005. http://www.theses.fr/2005AIX11044.
Der volle Inhalt der QuelleAdam, Jérémy. „Développement, modélisation et caractérisation d'une maille innovante réalisée en fabrication additive pour les grands défauts osseux“. Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0068/document.
Der volle Inhalt der QuelleThe work detailed in this thesis is about a titanium 3D printed mesh for large bone defects. Large bone defects are often due to surgical resections, performed after a cancer or an infection. When the defect reach a critical size, bone regeneration is impossible and it often leads to the loss of function. When it happened, the wound need to be cured using reconstructive surgery. The mandibular reconstruction is one of the most performed reconstructive surgery. Nowadays, we reconstruct the mandible with the fibula free flap technique, which require huge amount of time and resources for mixed results (around 10% failure rate). Based on the international literature, we developed a titanium 3D printed mesh to replace the fibula autograft and limit its side effect while offering to mesenchymal cells optimal growing environment. On the mechanical point of view, this environment requires to decrease the titanium initial rigidity from 110GPa to a range between 0.1 and 1GPa. In order to achieve that goal, we have developed a design methodology that lead us to innovation. We developed a load restauration system that allow us to combine low rigidity and high resistance. In order to find the final design, we used finite element modeling. Then, the final design have been tested mechanically in compression, traction and flexion. Because most of the requirements were reached, we designed an animal study which should take place in the next years. Eventually, we discovered some limitation for metallic 3D printing, essentially due to unsupported areas required for the load restauration. This innovative mesh is today optimized in order to be rapidly given to patients in the need
Caunègre, Pascal. „Contribution au test des circuits mixtes : modélisation et simulation de fautes“. Toulouse, INSA, 1996. http://www.theses.fr/1996ISAT0018.
Der volle Inhalt der QuelleLavoute, Laure. „Conception et fabrication d'une fibre unimodale à gaine résonante combinant large coeur et fort niveau de dopage“. Limoges, 2007. https://aurore.unilim.fr/theses/nxfile/default/270a2199-24b1-4c40-beb4-cd2f324542a7/blobholder:0/2007LIMO4051.pdf.
Der volle Inhalt der QuellePropagation and generation of high power in optical fibre are mainly limited by the nonlinear and thermal effects occurring when power density is too high. The original LHDC structures ("Large and Highly Doped Core") presented for the first time in this manuscript, can escape these limiting factor by combining a large core (i. E. Large mode area) and a high doping level (i. E. Low fibre length). The active core is surrounded by a resonant cladding made of high index inclusions. Thanks to optimized coupling relation between the core and the cladding rods, energy of high order modes of the core spreads over the cladding when the fundamental mode remains confined in the active region. This original modal filtering combined to gain discrimination guarantees the quality of spatial beam
Nowakowski, Samuel. „Détection de défauts dans les séries temporelles“. Nancy 1, 1989. http://www.theses.fr/1989NAN10074.
Der volle Inhalt der QuelleCurrie, Matthew Oren. „Advanced design, test and fabrication of silica based micro optics“. Thesis, Heriot-Watt University, 2016. http://hdl.handle.net/10399/3150.
Der volle Inhalt der QuelleSayre, Edward P. „The design, fabrication, and test of a CMOS operational amplifier /“. Online version of thesis, 1990. http://hdl.handle.net/1850/11226.
Der volle Inhalt der QuelleKam, ChiWeng. „902-928MHz UHF RFID Tag Antenna Design, Fabrication and Test“. DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/598.
Der volle Inhalt der QuelleMauroux, Pierre-Didier. „Test et fiabilité des mémoires Flash“. Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20185/document.
Der volle Inhalt der QuelleIn recent years, non-volatile Flash memories have been widely used on system on chip. Their high integration density and complexity of manufacturing process make the Flash memory prone to defects. The defects in the memory are one of the major issues. They could affect the performance, retention, endurance, and therefore the reliability of Flash memories. This thesis was focused on the analysis of failure mechanisms, the faulty behavior modeling and the development of solution in order to improve the testing of Flash memories. In this work, we have proposed an electrical SPICE model of an ATMEL Flash memory. Compared with the state of art, the proposed model allows to simulate the static and dynamic behavior of the memory. This model is used to perform defect injection simulations affecting the Flash memories. These simulations are able to predict faulty behavior by fault modeling. Other types of electrical simulations highlight two characterization methods. The first one is able to detect the oxide thickness variations of the memory cells; the second one allows to characterize the programming pulse and then predict the electric field value during the programming of the cell
Lavabre, Sylvie. „Amélioration de la testabilité des circuits séquentiels par émulation de configurations de test“. Montpellier 2, 1995. http://www.theses.fr/1995MON20103.
Der volle Inhalt der QuelleSchmitt, Vivien. „Design, fabrication and test of a four superconducting quantum-bit processor“. Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066184/document.
Der volle Inhalt der QuelleThis thesis presents our effort to design, fabricate and test a simple 4-Josephson qubit processor with scalability potential. The qubits are frequency tunable and are coupled to a shared coupling bus able to implement iSwap two-qubit gates on any pair of qubits. Each qubit is fitted with its own readout made of a Josephson bifurcation amplifier (JBA). The operation principle of the processor, the choice of parameters, the microwave layout design, as well as the fabrication processes are described. A first experiment demonstrates the simultaneous high-fidelity readout of all the qubits by frequency multiplexing of the JBA signals. A second one tests the two-qubit iSwap gate of the processor, the fidelity of which happens to be limited by the intrinsic qubit decoherence
Vallance, Robert Ryan. „Design and prototype fabrication of a manipulator for semiconductor test equipment“. Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/40216.
Der volle Inhalt der QuelleHaddad, Madjid. „Étude de l'impact des défauts d'usinage des structures composites par détourage sur leur comportement mécanique“. Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2179/.
Der volle Inhalt der QuelleThis thesis focuses on problems encountered during the trimming of composites materials using continuous fibers. The thesis is divided into three main parts. In the first part, the machinability of two composites materials made of carbon fiber and epoxy matrix at standard cutting speed and at high cutting speed is investigated. Surface damages induced are analyzed using surface roughness tester and the scanning electronic microscope. The impact of cutting conditions, machining processes (i. E. , cutting tool, abrasive diamond cutter, abrasive water jet machining), and nature of composite materials on the form and size of the surface defects are studied. The second part of the thesis concerns the study of the dust generated during trimming in terms of number of particles present in air and masses. The effect of tool geometry, composite material and cutting conditions on the generated dust is studied. The last part is dedicated to the study of the relationship between machining processes, surface defects and mechanical behaviour of composite parts in quasi-static and dynamic environment. Specimens designed for quasi static tests are instrumented on the surface for the digital images correlations and high speed cameras to monitor the damage generation and progression during the tests. The dynamic tests are instrumented by an infrared camera in order to measure the thermal dissipation during the damaging phases of specimens
Papavramidou, Panagiota. „Architectures de réparation des mémoires pour des hautes densités des défauts“. Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT090/document.
Der volle Inhalt der QuelleNanometric scaling increases the sensitivity of integrated circuits to defects andperturbations. Thus, each new generation of manufacturing process is accompanied by a rapiddegradation of manufacturing yield and reliability. Embedded memories occupy the largestpart of the area of SoCs and comprise the vast majority of transistors. In addition, forincreasing the integration density, they are designed very tightly to the design and electricalrules. Hence, embedded memories concentrate the majority of the manufacturing defectsaffecting a SoC, and are also more sensitive to perturbations. Thus, they are the parts of theSoC the most affected by the deterioration of manufacturing yield and reliability. This thesisdevelops repair architectures optimally combining test algorithms, BIST architectures, anderror correcting codes, in order to propose effective solutions for improving themanufacturing yield and reliability of embedded memories affected by high defect densities
Ginez, Olivier. „Modélisation de Fautes et Test des Mémoires Flash“. Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2007. http://tel.archives-ouvertes.fr/tel-00194584.
Der volle Inhalt der QuelleAlam, Muhammad Faisal. „Squeeze Casting as Alternative Fabrication Process for Carbon Fiber Reinforced Aluminium Matrix Composites“. Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24361.
Der volle Inhalt der QuelleSkjöldebrand, Charlotte. „Model test for fabrication and separation of wear particles in hip implants“. Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-202060.
Der volle Inhalt der QuelleTanner, Joseph Leo. „Fabrication and characterisation of multilayer test structures for coated conductor cylinder technology“. Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1282/.
Der volle Inhalt der QuelleOliveira, Otavio Gomes de. „Optimized microlens-array geometry for Hartmann-Shack wavefront sensor: design, fabrication and test“. Universidade Federal de Minas Gerais, 2012. http://hdl.handle.net/1843/BUOS-8U5NQT.
Der volle Inhalt der QuelleO sensor de frente de ondas de Hartmann-Shack (H-S) é aplicado a diversas áreas do conhecimento, da astronomia à inspeção industrial, em que a qualidade de meios ou componentes ópticos pode ser medida através das distorções (aberrações de frentes de onda) que eles inserem em uma frente de onda, seja por reflexão ou refração. Em oftalmologia, este sensor é um componente central da maioria dos aberrômetros, que são usados na avaliação da qualidade óptica do olho, em pesquisas e em diagnóstico clínico. O sensor de frentes de onda de H-S é também encontrado em sistemas ópticos adaptativos, que são usados para aumentar a qualidade de sistemas ópticos, por meio da compensação de aberrações de frentes de onda. Essas distorções nas frentes de onda podem representar um sério problema em diversas aplicações que requerem imagens de alta qualidade. A matriz de microlentes é um importante elemento no sensor de H-S responsável pela amostragem da frente de onda aberrada em pontos de luz no flano focal. A posição de cada ponto de luz relaciona a inclinação média da parte da frente de onda amostrada pela respectiva microlente. As coordenadas das posições de todos os pontos de luz são usados no processo de reconstrução modal para aproximar a topologia real da frente de onda através de uma combinação de funções ortonormais. O desvio dessa aproximação é chamado de erro de reconstrução. A amostragem da frente de onda é influenciada pelo padrão de distribuição das microlentes na matriz, formato e tamanho das microlentes, número de microlentes e fator de preenchimento da matriz. As matrizes comumente encontradas no mercado possuem, em geral, configura·o retangular ou hexagonal. A influência da geometria da matriz sobre o erro de reconstrução já foi discutido na literatura, que demonstrou que geometrias aleatórias podem apresentar performance melhor do que as geometrias regulares. Este trabalho propôs a otimização da geometria da matriz de microlentes para ser usada em um contexto específico, como oftalmologia. O trabalho consistiu de três fases: optimização numéica, para encontrar as matrizes ótimas; fabricação e teste em bancada óptica, para avaliar comparativamente a performance das matrizes fabricadas e uma matriz comercial. A otimização consiste na minimização do erro de reconstrução e/ou do número de microlentes necessárias na matriz, considerando uma estatística de aberrações conhecida. No contexto oftalmológico, usado como estudo de caso, foi demonstrado pelas simula·es que matrizes otimizadas com 10 ou 16 microlentes podem ser usadas para produzir erros de reconstrução da mesma ordem que matrizes retangulares com 36 microlentes. As matrizes otimizadas foram então fabricadas em uma sala limpa, onde corrosão anisotróica por KOH foi utilizada para obter-se moldes dos quais as microlentes foram replicadas em polímero. Foram fabricadas as matrizes otimizadas com 10 e 16 microlentes e também as matrizes retangulares com 16 e 36 microlentes. Todas as matrizes foram testadas e comparadas com uma matriz hexagonal comercial, com 127 microlentes. Os testes foram feitos com uma aberração arbitrária, mas compatível com a estatística estudada. Os resultados finais corroboram com os previstos pelas simula·es computacionais.
Burt, Colin. „Design, Fabrication and Test of an Operationally Responsive Aircraft with NIIRS Evaluated Imager“. DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1087.
Der volle Inhalt der QuelleXu, Yan. „Fabrication et caractérisation des films CuInGase2 par pulvérisation cathodique : étude des défauts par la spectroscopie des pièges profonds par la charge“. Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=832d9b8a-0f75-4de7-ab4a-836b5de21036.
Der volle Inhalt der QuelleIn this work, we have focused on defects that can be formed in the film of CIGS obtained by RF sputtering of a quaternary target. For fabrication of diodes, we have set up a four step protocol to deposit reproducible composite thin films. We found that the film composition is different from that of the best absorber layer, but the spectroscopic analyses performed on the obtained films showed that their characteristics matched those of chalcopyrite in CIGS. We have determined the electrical characteristics of Schottky diodes using CIGS as an active layer by current-voltage measurements. We determined the trap parameters of the devices making use of the charge based deep level transient spectroscopy. Two trap groups have been identified: shallow trap group with activation energy (<100meV) and deep trap group (>100meV). The trap density is sensitive to the nature of the interfacial regions between the compound and the electrode showing that the Schottky contact impacts strongly on defect formations
Bui, Minh Hien. „Identification et simulation des incertitudes de fabrication“. Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00697204.
Der volle Inhalt der QuelleVerguin, Dulieux Pascale. „Industrialisation d'une méthode de localisation de défauts sur circuits intégrés par cristaux liquides“. Grenoble INPG, 1994. http://www.theses.fr/1994INPG0177.
Der volle Inhalt der QuelleMarc, François. „Elaboration d'une méthodologie de localisation de défauts sur circuits intégrés logiques par test sous faisceau d'électrons : application à différentes fonctions électroniques“. Bordeaux 1, 1994. http://www.theses.fr/1994BOR10605.
Der volle Inhalt der QuelleGarcia, Alain. „Contribution à l'étude des mécanismes de création de défauts lors de la réalisation de substrats simox“. Grenoble INPG, 1995. http://www.theses.fr/1995INPG0057.
Der volle Inhalt der QuelleMoslemi, Parisa. „Design, fabrication, and test of a radiating element for a KU-BAND smart antenna“. Mémoire, École de technologie supérieure, 2012. http://espace.etsmtl.ca/1107/7/MOSLEMI_Parisa.pdf.
Der volle Inhalt der QuelleStoney, Robert Brian, und Richard M. Howard. „Design, fabrication and test of a vertical attitude takeoff and landing unmanned air vehicle“. Thesis, Monterey, California. Naval Postgraduate School, 1993. http://hdl.handle.net/10945/24146.
Der volle Inhalt der QuelleHarlan, Andrew R. (Andrew Ryan). „Design and fabrication of a test apparatus for lightweight flexible space modules for assembly“. Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40438.
Der volle Inhalt der Quelle"May 2007."
Includes bibliographical references (p. 52-53).
Future space missions will require the on-orbit construction of large structures, such as solar arrays and telescopes. Currently, on-orbit construction and maintenance work is primarily accomplished by astronauts, during extra-vehicular "space walks". These are expensive and pose risks to the astronauts' lives. In the future, it is expected that an increasing number of on-orbit construction missions will be performed by autonomous robotic systems. Large structures will be constructed using modules made of lightweight materials, and will be very flexible. In MIT's Field and Space Robotics Lab (FSRL), algorithms are being developed to optimize the transportation and assembly of large, flexible structures. To test these algorithms, it is necessary to have laboratory flexible beam modules with similar properties to structural space modules. This thesis presents a design for a set of flexible modules which have comparable properties to proposed space modules. These modules are designed to be manipulated by a team of laboratory robots. The design process and final design of the flexible beam, which comprises a majority of the flexible module is presented. Several gripping devices, which attach the modules to robot manipulators, are also designed.
by Andrew R. Harlan.
S.B.
Kudaravalli, Venkata Narayana Chowdary. „Design and fabrication of test-bed for testing attitude determination of spin stablilized spacecraft“. Thesis, Luleå tekniska universitet, Rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62223.
Der volle Inhalt der QuelleMio, Antonio Massimiliano. „Crystallization of Amorphous Chalcogenide Nano-Regions and Test-Structure Fabrication for Non-Volatile Memories“. Doctoral thesis, Università di Catania, 2012. http://hdl.handle.net/10761/931.
Der volle Inhalt der QuelleVaurette, François. „Fabrication top-down, caractérisation et applications de nanofils silicium“. Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10009/document.
Der volle Inhalt der QuelleThis work focuses on the study of silicon nanowires made by a top-down approach. The context of the study is the miniaturisation of the components and the understanding of the transport in 1D systems. Two fabrication approaches are studied : AFM lithography (Atomic Force Microscope) and e-beam lithography. The latter being more reproducible, the final devices are fabricated by this technique using a SOI substrate and multiple steps of etching and metallization.Transport characterization of the Si nanowires allows us to highlight a depleted area at the interface Si/native SiO2. Using nanowires with different widths and lengths, we can determine the depletion width, the surface state density as well as the doping level of the nanowires. The evolution of the nanowires resistance with temperature is also investigated, showing a dependence associated with surface phonons scattering. In the last chapter, three applications are described : a decoder, a current switch and a biosensor. The use of a local etching allows the modulation of the conduction band of the nanowires, opening the way to build a decoder using two local gates. Crossbar structures, where lateral gates which can derive the current in the di_erent branches, lead to the fabrication of a current switch. Finally, thanks to the large surface to volume ratio in these structures, the nanowires are used to detect electrically the interactions between molecules (ovalbumine detection)
Jouy, Franck. „Contribution à la modélisation et à l'identification des défauts géométriques des machines à coordonnées : application au contrôle intégré en atelier flexible“. Châtenay-Malabry, Ecole centrale de Paris, 1987. http://www.theses.fr/1987ECAP0031.
Der volle Inhalt der QuelleTichadou, Stéphane, und Stéphane Tichadou. „Modélisation et quantification tridimensionnelles des écarts de fabrication pour la simulation d'usinage“. Phd thesis, Ecole centrale de nantes - ECN, 2004. http://tel.archives-ouvertes.fr/tel-00456836.
Der volle Inhalt der QuelleAlameh, Kawthar. „Contribution au diagnostic et a l'analyse de défauts d'une machine synchrone à aimants permanents“. Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR072/document.
Der volle Inhalt der QuelleThe advent of new magnetic materials and recent advances in power electronics have played a major role in the progress of hybrid electric vehicles. Nowadays, permanent magnet synchronous machines (PMSM) thanks to their performances, especially their energy efficiency, are considered as ideal candidates for the traction chains of hybrid and electric vehicles. However, due to material aging, manufacturing defects or severe operating conditions, different types of faults are capable to occur in the machine components, its control or measuring devices. In order to ensure safety, reliability and availability, the integration of a fault diagnosis and condition monitoring approach in the automotive electrical powertrain system is becoming more and more important. In this context, the aim of the thesis is to contribute to the diagnosis and characterization of faults in the PMSM based on a vibration analysis. First, analytical modeling approaches for the PMSM and inter-turn short-circuits, eccentricity and rotor demagnetization faults will be proposed. The major interest of such models, in a diagnosis context, is to study the behavior of the machine in the presence of studied faults in order to deduce the most suitable detection methods. In addition, numerical models will be developed in order to validate the analytical magnetic and mechanical parts of the machine as well as the demagnetization fault. In the phase of fault impact analysis, we will focus on the cases of rotor eccentricity and demagnetization. The fault indicators will be extracted from the vibratory signal representations in time and space domains and their Fourier transforms, in the cases of single faults and the cases of two combined faults. For single fault cases, two diagnosis approaches will be proposed: the first uses the principle of statistical tests and fault signature tables, inspired by model-based diagnosis methods, while the second relies on a set of three neural networks, such as each one is with a single input and a single output and dedicated to isolate one type of fault. Finally, the performance of these two approaches, in terms of robustness and adaptability, will be compared for the same training and test sets
Mokhtari, Merwan. „Étude physique des défauts induits par les procédés de fabrication de lasers à émission par la surface (VCSEL) à confinement par diaphragme d'oxyde“. Thesis, Rennes 1, 2019. https://ged.univ-rennes1.fr/nuxeo/site/esupversions/0ee68d0c-8e0d-4d1d-b904-5340f044131c.
Der volle Inhalt der QuelleNowadays, VCSELs are key components for datacom applications. The work presented is focused on the study of the mechanical deformations induced by the steps initiating the manufacturing process of GaAs based VCSELs operating at 850 nm and including aluminum-oxide as confinement layers. The use of non-destructive techniques such as the measurement of the degree of polarization of photoluminescence (DOP) and micro-photoluminescence allowed us to obtain a precise vision both spatially and quantitatively of these mechanical deformations. The effects induced in VCSEL structures after dielectric deposition used as a hard mask for etching, plasma etching of the P-mesa and wet thermal oxidation of the confinement layers have thus been characterized. Stress values of several tens of MPa were measured in a VCSEL structure conducted through the various process steps up to oxidation. We have experimentally demonstrated that it is possible to reduce the mechanical stress generated by the oxidation process by up to 25% by performing a post-oxidation annealing. A study by STEM-EELS of the oxide morphology and its atomic composition at a local scale has helped us to refine the physical interpretation of the effect related to this annealing. Based on the experimental DOP results, analytical and numerical modeling approaches were also carried out to predict the mechanical deformations induced by the different process steps mentioned above. Finally, we presented the first electrical and optical characterizations performed on such VCSELs showing that the studied devices are in agreement with the internal specifications and that the fabrication process can be considered as uniform