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Dissertations / Theses on the topic 'Microstructured surface'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 April 2022

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1

Neumann, Stephan, Georg Jacobs, Achim Feldermann, and Felix Straßburger. "Reducing Friction and Leakage by Means of Microstructured Sealing Surfaces – Example Mechanical Face Seal." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199867.

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By defined structuring of sliding surfaces at dynamic contact seals friction and leakage can be reduced. Compared to macro-structures, micro-structures have the advantage of a quasi-homogeneous influence on the fluid behavior in the sealing gap. The development of suitable microstructures based on prototypes, whose properties are studied on the test bench, is very expensive and time-consuming due to the challenging manufacturing process and measuring technologies, which are necessary to investigate the complex rheological behavior within the sealing gap. A simulation-based development of micro

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2

Yang, Zhugen. "3D-Microstructured Protein Chip for Cancer Diagnosis." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00780192.

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Protein microarrays are becoming powerful tools to screen and identify tumor markers for cancer diagnosis, because of the multiplex detection and minute volume of sample requirement. Due to the diversity and variation in different cancers, no single tumor marker is sensitive and specific enough to meet strict diagnostic criteria. Therefore, a combination of tumor markers is required to increase sensitivity and to establish distinct patterns to increase specificity. To obtain reliable tests, the development of reproducible surface chemistry and immobilization procedure are crucial steps in the

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3

Zhang, Bo. "Magnetic fields near microstructured surfaces : application to atom chips." Phd thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2009/2898/.

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Microfabricated solid-state surfaces, also called atom chip', have become a well-established technique to trap and manipulate atoms. This has simplified applications in atom interferometry, quantum information processing, and studies of many-body systems. Magnetic trapping potentials with arbitrary geommetries are generated with atom chip by miniaturized current-carrying conductors integrated on a solid substrate. Atoms can be trapped and cooled to microKelvin and even nanoKelvin temperatures in such microchip trap. However, cold atoms can be significantly perturbed by the chip surface, ty

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4

Bostanci, Huseyin. "HIGH HEAT FLUX SPRAY COOLING WITH AMMONIA ON ENHANCED SURFACES." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3209.

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Many critical applications today, in electronics, optics and aerospace fields, among others, demand advanced thermal management solutions for the acquisition of high heat loads they generate in order to operate reliably and efficiently. Current competing technologies for this challenging task include several single and two phase cooling options. When these cooling schemes are compared based on the high heat flux removal (100-1000 W/cm2) and isothermal operation (within several oC across the cooled device) aspects, as well as system mass, volume and power consumption, spray cooling appears to b

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5

Wunderlich, Philipp Verfasser], Ulrich [Akademischer Betreuer] [Simon, and Dirk Uwe [Akademischer Betreuer] Sauer. "Surface-modified microstructured carbon electrodes for lithium-oxygen batteries / Philipp Wunderlich ; Ulrich Simon, Dirk Uwe Sauer." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1220082635/34.

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6

Widyaya, Vania Tanda [Verfasser], and Karen [Akademischer Betreuer] Lienkamp. "Three-dimensional, bioactive microstructured surface-attached polymer network by microcontact printing - simultaneous antimicrobial activity, protein repellency, and cell compatibility." Freiburg : Universität, 2019. http://d-nb.info/1205663304/34.

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7

Yata, Vishnu Vardhan Reddy. "Investigation of Spray Cooling Schemes for Dynamic Thermal Management." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984153/.

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This study aims to investigate variable flow and intermittent flow spray cooling characteristics for efficiency improvement in active two-phase thermal management systems. Variable flow spray cooling scheme requires control of pump input voltage (or speed), while intermittent flow spray cooling scheme requires control of solenoid valve duty cycle and frequency. Several testing scenarios representing dynamic heat load conditions are implemented to characterize the overall performance of variable flow and intermittent flow spray cooling cases in comparison with the reference, steady flow spray c

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8

Aqil, Sanaa. "Wetting of microstructured surfaces." Thesis, Nottingham Trent University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431843.

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9

Rjiba, Narjes. "Fibre de coton : microstructures et propriétés de surface." Mulhouse, 2007. http://www.theses.fr/2007MULH0873.

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Le principal objectif de ce travail était de caractériser d'un point de vue physico-chimique la surface de la fibre de coton. Une fibre brute et une fibre extraite à l'éthanol ont été analysées. Cette caractérisation a été principalement menée par chromatographie gazeuse inverse (IGC), permettant de déterminer l'énergie de surface de ces fibres en fonction de la température ainsi que leur morphologie de surface à une échelle moléculaire, avant et après traitement. Il a été montré que l'énergie de surface de la fibre brute dépend fortement de la présence de cires et de pectines qui recouvrent u

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10

Agarwal, Vivek. "Microstructure studies in surfactant systems /." View online ; access limited to URI, 2004. http://wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3160026.

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11

Tusamda, Wakhloo Nayana. "Deformability of cancer cells on 3D microstructured surfaces." Thesis, Mulhouse, 2018. http://www.theses.fr/2018MULH2259.

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Cette thèse traite de la compréhension du comportement de différents types de cellules cancéreuses sur des surfaces microstructurées. Nous avons étudié le comportement de cellules issues d’ostéosarcome (SaOS-2) et en particulier leur déformation nucléaire sur des micro-piliers confinés. Nous avons analysé le rôle du cytosquelette, des adhésions focales (AF), du nucléosquelette (LINC et lamin A) et de la chromatine, sur cette déformation. L'actomyosine et les filaments intermédiaires de vimentine jouent un rôle crucial dans l'orchestration de la déformation nucléaire. Nous avons constaté que la

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12

Bonhomme, Céline. "Turbulences et ondes en milieu naturel stratifié : deux études de cas : étude du mélange turbulent et des ondes internes du lac Pavin (Auvergne, France) ; influence des ondes de Rossby sur la concentration en chlorophylle de surface dans l'upwelling du Pérou." Phd thesis, Université Paris-Est, 2008. http://tel.archives-ouvertes.fr/tel-00558713.

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Dans les milieux aquatiques, les facteurs liés à l'hydrodynamique et au mélange aux échelles de la turbulence sont déterminants pour le transport des substances chimiques et des micro-organismes. Ce travail s'intéresse à ces phénomènes physiques et se situe à la frontière entre la limnologie physique et l'océanographie physique, au travers de l'étude de deux cas : le lac Pavin (Auvergne, France) et la région d'upwelling au large du Pérou. Un des intérêts de ce travail réside dans le changement d'échelle de l'observation de milieux naturels aquatiques allant de l'échelle millimétrique (étude de

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13

Qin, Ren-Yan. "Etude de la microtexture et de la microstructure superficielle et des propriétés physico-chimiques des surfaces des fibres de carbone." Mulhouse, 1992. http://www.theses.fr/1992MULH0235.

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L'objectif de cette étude est d'examiner, grâce à la microscopie à effet tunnel (STM), la microtexture et la microstructure superficielle des fibres de carbone de diverses origines, et de caractériser physico-chimiquement, grâce à la mise en oeuvre de plusieurs méthodes analytiques, la surface des fibres de carbone ayant subi différentes températures de traitement thermique (TTT) et différentes intensités d'oxydation anodique. En premier lieu, la STM a permis de distinguer les aspects superficiels des fibres de carbone qui sont liés à la filature du précurseur et de mettre en évidence les troi

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14

Hollabaugh, Kate R. "Microstructure and rheology of mixed ionic surfactants." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 108 p, 2009. http://proquest.umi.com/pqdweb?did=1654493531&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Thesis (M.Ch.E.)--University of Delaware, 2008.<br>Principal faculty advisors: Norman J. Wagner, Dept. of Chemical Engineering; and Eric W. Kaler, College of Engineering. Includes bibliographical references.

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15

Festy, Frederic. "Structural and spectroscopic studies of surfaces on the nanometre scale." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368802.

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16

Anders, Sebastian [Verfasser]. "Interactions between biosystems and 3D microstructured surfaces / Sebastian Anders." München : Verlag Dr. Hut, 2019. http://d-nb.info/1181514142/34.

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17

Yeung, Chun L. "Design and fabrication of microstructured and switchable biological surfaces." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1712/.

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The research presented in this thesis explores the design and fabrication of microstructured and switchable biological surfaces, which may have potential applications of nanobiotechnology. The thesis focuses on the fabrication of biological surfaces which can be controlled via external stimuli. Chapter 1 - Introduction to Nanobiotechnology - presents an introduction to the background of this research including the role of self-assembled monolayers (SAMs) in nanobiotechnology, microstructure fabrication techniques, stimuli responsive surfaces and cell migration. Chapter 2 - Surface characteriza

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18

Ruleman, Karlen E. (Karlen Elizabeth). "Heat transfer via dropwise condensation on hydrophobic microstructured surfaces." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54510.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 22).<br>Dropwise condensation has the potential to greatly increase heat transfer rates. Heat transfer coefficients by dropwise condensation and film condensation on microstructured silicon chips were compared. Heat transfer coefficients are found to be seventy percent higher in the hydrophobic, dropwise condensation case relative to the hydrophilic, film condensation case. With this increased heat transfer coefficient,

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19

Safdar, Adnan. "Microstructures and surface roughness of EBM produced Ti-6Al-4V." Licentiate thesis, Malmö högskola, Teknik och samhälle, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-7791.

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The work presented in this dissertation is concerned with the microstructures andsurface roughness of test slabs of Ti-6Al-4V produced by one of powder based AdditiveManufacturing (AM) technique namely Electron Beam melting (EBM). The effects of processparameters of a EBM system and geometry factors of a EBM build such as slabs’ thickness andheight etc. on the microstructure and the surface roughness of the EBM produced Ti-6Al-4Vhave being investigated. The processing parameters of the EBM system involved in the presentwork include beam current, scan speed, offset focus and scanning length etc

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20

Henrie, Benjamin L. "Elasticity in Microstructure Sensitive Design Through the use of Hill Bounds." Diss., CLICK HERE for online access:, 2002. http://contentdm.lib.byu.edu/ETD/image/etd60.pdf.

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21

Abdelaziz, Gamal E. "Microstructural analysis of surface and interface zones in concrete." Thesis, Aston University, 1997. http://publications.aston.ac.uk/13268/.

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Several of OPC paste and concrete specimens, with different mix proportions, were cast against CPF and impermeable formwork (IF) and the profiles of pore structure, microhardness and scratch hardness of the cover zone were established. The chloride ingress and the depth of carbonation of the surface zone of concrete cast against CPF and IF were investigated. The main mechanisms controlling the ECR processes and the factors affecting such treatment were critically reviewed. Subsequently, as a means of restoring passivation of steel embedded in carbonated concrete, such HCP specimens were subjec

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22

Lesage, Thibault. "Grippage des aciers inoxydables : influence de la nature des matériaux, de la microstructure et des traitements thermochimiques de surface." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2486/document.

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Le grippage dans le cas des aciers inoxydables est un phénomène complexe nécessitant une approche multi-échelle et multi-physique. Les 6 nuances d’aciers inoxydables sélectionnées au cours de cette thèse (316L, 316LN, Nitronic60, AISI660, Uranus45N et 17-4PH) ont été étudiées à l’état de réception et après traitements thermochimique de surface de type S3P. Ces matériaux ont subi un essai de grippage selon la norme ASTM G98 et les échantillons qui en résultent ont été caractérisés selon une approche d’abord surfacique (évolution de la morphologie de la surface, observations MEB…) puis en volume

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23

Deng, Dunyong. "Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties." Licentiate thesis, Linköpings universitet, Konstruktionsmaterial, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-144491.

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Additive manufacturing (AM), also known as 3D printing, has gained significant interest in aerospace, energy, automotive and medical industries due to its capabilities of manufacturing components that are either prohibitively costly or impossible to manufacture by conventional processes. Among the various additive manufacturing processes for metallic components, electron beam melting (EBM) and selective laser melting (SLM) are two of the most widely used powder bed based processes, and have shown great potential for manufacturing high-end critical components, such as turbine blades and customi

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24

Durand, Corinne. "Atomisation de gouttes liquides sur une cible tournante microstructurée." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI035.

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L’objectif de ce travail est de concevoir un outil d’atomisation adapté à la production de poudres de carburede tungstène dans l’entreprise Technogenia, située à Saint-Jorioz (74). Plus généralement, nous avons étudiéune nouvelle conception d’atomiseur rotatif pour lequel les surfaces d’atomisation sont orientées selon un angled’incidence non nul. Une telle orientation permet alors d’exploiter de façon plus efficace la fréquence de rotationde l’atomiseur ainsi que les forces de centrifugation et de Coriolis. A partir de cette base de réflexion, troisgéométries de surface d’atomisation ont été

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25

Zhu, Yangying. "Magnetic tunable microstructured surfaces for thermal management and microfluidic applications." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82355.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 46-47).<br>Micro and nanostructured surfaces have broad applications including heat transfer enhancement in phase-change systems and liquid manipulation in microfluidic devices. While significant efforts have focused on fabricating static micro/nanostructured arrays, uniform arrays that can be dynamically tuned have not yet been demonstrated. In this work, we present a novel fabrication process for magnetically tunable

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26

Tanguy, Perrine. "Impact de la microstructure des revêtements ZnAlMg sur les mécanismes de formation et la performance des couches de conversion sans Cr." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEC007.

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Les revêtements multiphasés ZnAl(Mg) se caractérisent par une microstructure et une chimie de surface très différentes de celles des revêtements traditionnels de zinc pur. La réactivité de ces surfaces est par conséquent différente de celle avec l'acier galvanisé et la compatibilité avec les traitements de surface nécessairement impactée. Ce constat est à l’origine de cette proposition de thèse qui, tout en développant des compétences robustes sur la thématique des traitements de surface sur revêtements multiphasés, permettra d’améliorer notre connaissance des mécanismes mis en jeu lors de la

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27

Jay, Olivier. "Magnesium for biomedical applications as degradable implants : thermomechanical processing and surface functionalization of a Mg-Ca alloy." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI104/document.

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Depuis la dernière décennie, les implants dégradables pour fixation de fracture connaissent un intérêt grandissant. Parmi tous les matériaux, le magnésium apparait comme un candidat prometteur dû à une combinaison unique de propriétés. Le magnésium est très bien toléré par le corps, il a une tendance naturelle à la dégradation et son faible module élastique peut aider à réduire le stress-shielding durant la reconstitution de l'os. Cependant, une combinaison optimale entre les propriétés mécaniques et la vitesse de dégradation doit être obtenue. Le calcium étant biocompatible et procurant diffé

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28

Farajollahi, Farid [Verfasser]. "Formation of self-assembled microstructure on the polymer surface / Farid Farajollahi." Ulm : Universität Ulm. Fakultät für Naturwissenschaften, 2016. http://d-nb.info/1084767732/34.

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29

Mason, Stephen. "The microstructure, mechanical properties and surface transformations of a syalon ceramic." Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/73126/.

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The potential application of nitride based ceramics in structural applications is dependent on their performance at elevated temperatures. To meet these demands the microstructure of a syalon ceramic has been refined. Improved processing techniques, by the use of high purity powders and "balanced" compositions, have been shown to improve the degree of inter granular crystallisation. The key aspects are the reduction of impurity levels, particularly calcium, and the use of high nitrogen compositions such that full crystallisation is achieved. The achievement of complete crystallisation results

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30

Reitmeier, Zachary J. "The Chemistry and Surface Microstructure of Si-Based Substrates and their Effect on the Evolution of the Microstructures of III-Nitride Films Grown via Metalorganic Vapor Phase Epitaxy." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-03202005-194018/.

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The present research was undertaken with the goals of understanding the evolution of defects and strain in heteroepitaxial AlN and GaN films deposited via metalorganic vapor phase epitaxy and minimizing those defects through manipulation of the substrate. As observed with atomic force microscopy (AFM), AlN initially grew in the form of flat-topped islands on as-received SiC substrates. Threading dislocations (TDs) observed in transmission electron microscopy (TEM) images initiated at the AlN/SiC interface as the result of defects at the surface of the mechanically polished substrate and/or con

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31

Mammen, Lena [Verfasser]. "Controlled wetting on silica-based nano- and microstructured surfaces / Lena Mammen." Mainz : Universitätsbibliothek Mainz, 2015. http://d-nb.info/1076186890/34.

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32

Wu, Tso-chang. "Laser Surface Modification of AZ31B Mg Alloy Bio-Implant Material." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248459/.

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Magnesium and its alloys are considered as the potential biomaterials due to their biocompatibility and biodegradable characteristics but suffer from poor corrosion performance. Various surface modification techniques are employed to improve their corrosion resistance. In present case, laser surface melting was carried out on AZ31B Mg alloy with various laser energy densities using a continuous wave ytterbium laser. Effect of laser treatment on phase and microstructure evolution was evaluated by X ray diffraction and scanning electron microscopy. Multi-physics thermal model predicted time temp

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33

Adams, Brandy Rogers. "Ceramic materials mimicking normal bone surface microstructure and chemistry modulate osteoblast response." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50292.

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Bone consists of collagen/hydroxyapatite (HA) composites in which poorly crystalline carbonated calcium phosphate is intercalated within the fibrillar structure. Normal bone mineral is a carbonated-apatite, but there are limited data on the effect of mineral containing carbonate on cell response. Although the exact biological role of silicate in bone formation is unclear, silicate has been identified at trace levels in immature bone and is believed to play a metabolic role in new bone formation. To mimic the inorganic and organic composition of bone we have developed a variety of bone graft s

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Munzer, Charlotte. "Etude de l'action d'un bioadjuvant aux substances extracellulaires sur la microstructure et les caractéristiques de surface de pâtes cimentaires pour des bétons plus éco-respectueux." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAD028/document.

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L’influence de l’incorporation d’un produit bio sourcé comme adjuvant dans les matériaux cimentaires tant à l’état frais qu’à l’état durci a été étudiée. La présence du bioproduit ne provoque pas de modifications sur les résistances mécaniques et sur la microstructure des pâtes de ciment (ATG/ATD et DRX). Des essais de caractérisation du réseau poreux de mortiers et pâtes cimentaires ont montré un effet du bioproduit sur la qualité de la peau des échantillons. Un protocole de réalisation et de conservation d’échantillons de pâte cimentaire a été mis au point afin de permettre différents essais

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35

Marquier, François. "Interaction des ondes de surface avec des microstructures périodiques : émission thermique cohérente et transmission résonante." Phd thesis, Ecole Centrale Paris, 2004. http://tel.archives-ouvertes.fr/tel-00010113.

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Certains matériaux ont des modes électromagnétiques confinés à leur surface, qui se<br />propagent le long de celle-ci. Ces modes, qui sont appelés ondes de surface, peuvent être couplés à des ondes propagatives à l'aide d'un réseau.<br />Nous avons utilisé un code de calcul électromagnétique exact, basé sur l'analyse rigoureuse des ondes couplées (RCWA), pour optimiser des structures périodiques dont les dimensions sont de l'ordre ou inférieures au micron. Nous avons ainsi conçu des micro ou nanostructures pour deux types d'applications : l'émission thermique cohérente, et la transmission rés

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Dixon, Richard John. "Ion scattering studies of the surface and near surface region of metals and semiconductors." Thesis, University of Warwick, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343788.

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Mazinanian, Neda. "Influence of microstructure and proteins on the metal release of micron-sized stainless steel powder particles." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98082.

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Knowledge on metal release processes from stainless steel powder, which can be potentially inhaled at occupational settings, is essential within the framework of human health and environmental risk assessments. An in-depth knowledge concerning powder history, physical properties of particles (e.g. size, morphology, and active surface area) combined with their chemical properties (such as the chemical composition of the particles and their metal release behavior) is needed for better understanding of the interaction mechanisms between metal powders and humans. So far, limited in vitro and in vi

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Högström, Herman. "Optical Studies of Periodic Microstructures in Polar Materials." Doctoral thesis, Uppsala University, Department of Engineering Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6896.

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<p>The optical properties of matter are determined by the coupling of the incident electromagnetic radiation to oscillators within the material. The oscillators can be electrons, ions or molecules. Close to a resonance the dielectric function exhibits strong dispersion and may be negative. A negative dielectric function gives rise to a complex wave vector which is associated with no allowed states for photons, i.e. high extinction and bulk reflectance, as well as the possibility to support surface waves. </p><p>It is possible to manufacture a dielectric material that generates a complex wave v

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Srivastava, Ashish Kumar Mirshams Reza. "Orientation, microstructure and pile-up effects on nanoindentation measurements of FCC and BCC metals." [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-6050.

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Egbujor, Grace. "Surface Microstructure Evolution of Metallic Specimens Using the Large Chamber Scanning Electron Microscope." TopSCHOLAR®, 2015. http://digitalcommons.wku.edu/theses/1473.

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An initial study into the use of the large chamber scanning electron microscope (LCSEM) to interrogate the surface microstructure evolution of metallic specimens has been carried out. The LC-SEM located at Western Kentucky University is the largest instrument of its type at any university in the world. As such, unique measurements can be performed due to the size of its chamber and extended view of its optic system. Strain was varied for each individual specimen, and imaged using Secondary Electrons within the gauge length as well as near the grip position. Results will show progression of sur

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Larrouturou, Florent. "Amélioration des propriétés radiatives des récepteurs solaires surfaciques haute température par microstructuration." Thesis, Perpignan, 2015. http://www.theses.fr/2015PERP0030.

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La filière solaire thermodynamique, et plus précisément la technologie des centrales à tour, est l'une des ressources d'énergies renouvelables les plus prometteuses. Le travail de thèse s’inscrit dans le cadre général de l’augmentation des rendements de centrales solaires à tour où l’augmentation de l'efficacité et de la température du récepteur joue un rôle clé. L’originalité de la thèse réside dans l’étude du rôle des sélectivités spectrale et directionnelle sur le rendement de récepteurs surfaciques à haute température. L’objectif poursuivit a été d’améliorer simultanément la géométrie, le

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Carmagnola, Carlo Maria. "Mesure, analyse et modélisation des processus physiques du manteau neigeux sec Implementation and evaluation of prognostic representations of the optical diameter of snow in the SURFEX/ISBA-Crocus detailed snowpack model Snow spectral albedo at Summit, Greenland: measurements and numerical simulations based on physical and chemical properties of the snowpack." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU014.

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La neige est un matériau poreux dont la microstructure change en permanence. L'ensemble de ces transformations, qui prend le nom de ``métamorphisme", est susceptible d'affecter les propriétés thermiques, mécaniques et électromagnétiques de la neige au niveau macroscopique. En particulier, les échanges d'énergie et de matière à l'intérieur du manteau neigeux et entre la neige et l'atmosphère sont fortement influencés par l'évolution au cours du temps de la microstructure de la neige. Une représentation adéquate du métamorphisme dans les modèles de manteau neigeux s'avère donc cruciale. La micro

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Goujat, Alexis. "Inlays/onlays usinés par CFAO : critères d’évaluation in vitro des assemblages collés, complémentarité des études expérimentales." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1001/document.

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De nombreux paramètres interviennent dans la longévité des inlays/onlays réalisés par CFAO tels que l’usinabilité et les propriétés mécaniques des matériaux utilisés, l’adaptation de la restauration ainsi que la qualité de l’interface entre le matériau de restauration en céramique ou en composite et le matériau d’assemblage. Dans un premier temps, au travers d’une revue systématique de la littérature, nous avons sélectionné les méthodes expérimentales et les paramètres permettant d’évaluer l’adaptation de ces restaurations. Il existe des techniques en 2D qui mesurent l’espace dent-matériau à d

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Gunnerek, Rasmus. "Fatigue behavior of Ti-6Al-4V alloys manufactured by Selective Laser Melting : Influence of microstructure, surface roughness and surface morphology." Thesis, Karlstads universitet, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-67514.

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The intention of this thesis is to investigate the fatigue behavior of the Ti-6Al-4V alloy manufactured by the relatively new additive manufacturing process called Selective Laser Melting(SLM). SLM has been shown the interest from important industries such as the aerospace and biomedical industry for its potential of manufacturing lightweight and complex parts to net shape without the need of conventional methods like machining. Due to the short history of SLM there is little knowledge about how fatigue properties are influenced by the manufacturing process. This project aims to add to that k

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Leïchlé, Thierry. "Bioplume : A MEMS-based picoliter droplet dispenser with electrospotting means for patterning surfaces at the micro-and nanometer scales." Toulouse 3, 2006. http://www.theses.fr/2006TOU30267.

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Les travaux présentés dans cette thèse portent sur la conception et la réalisation d'un système de dépôt de gouttes micrométriques à l'aide de matrices de leviers en silicium. L'originalité de ce système, nommé Bioplume, repose sur l'intégration de capteurs de forces et sur l'utilisation de méthodes de dépôt assistées par champ ou par auto-assemblage pour contrôler in-situ la taille, l'uniformité et la composition des motifs réalisés. Le système fonctionne en boucle fermée afin d'automatiser la fabrication de micromatrices de spots tout en garantissant la correction des erreurs d'alignement et

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Robertson, Stephanie. "Microstructural manipulation by laser irradiation of prepared samples : The ’Snapshot Method’." Licentiate thesis, Luleå tekniska universitet, Produkt- och produktionsutveckling, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76150.

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Various metallurgical microstructures and their formation are studied in this thesis by using a laser beam to melt a variety of materials with different chemical compositions over a range of thermal cycles. The laser beam was used conventionally in a narrow gap multi-layer weld, used for welding large depths with filler wire additions, as well as a non-traditional simulated welding approach labelled here as the Snapshot method. In laser beam welding, materials go through rapid heating and cooling cycles that are difficult to mimic by other techniques. In welding, any microstructural developmen

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Akhtar, Anisa Shera. "Surface science studies of conversion coatings on 2024-T3 aluminum alloy." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/1713.

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The research in this thesis aims to develop new mechanistic knowledge for coating processes at 2024-Al alloy surfaces, ultimately to aid the design of new protective coatings. Coatings formed by phosphating, chromating, and permanganating were characterized especially by scanning Auger microscopy (SAM), X-ray photoelectron spectroscopy, and scanning electron microscopy . The objective was to learn about growth (nm level) as a function of time for different coating baths, as well as a function of lateral position across the different surface microstructural regions, specifically on the μm-sized

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Vüllers, Felix [Verfasser]. "Bioinspired Superhydrophobic Nano- and Microstructured Surfaces for Drag Reduction and Optoelectronics / Felix Vüllers." Karlsruhe : KIT Scientific Publishing, 2018. http://www.ksp.kit.edu.

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Rault, Vincent. "Analyse locale de la corrosion des renforts métalliques dans les pneumatiques exposés à des environnements représentatifs : vers un modèle prédictif." Thesis, Dijon, 2015. http://www.theses.fr/2015DIJOS022.

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Le sujet de thèse concerne l’analyse et la prédiction de la corrosion des renforts métalliques exposés dans des environnements représentatifs. Dans cette étude, le système va se complexifier en commençant à partir du renfort métallique délaitonné (acier perlitique) en passant par le renfort métallique laitonné (couche de laiton) pour finir avec le renfort métallique sulfuré (couche de sulfures). Cette approche permet de comprendre pas à pas les phénomènes de corrosion ainsi que l’interaction entre les différentes couches. Les matériaux de l’étude sont caractérisés au départ par des techniques

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Gardner, Timothy John. "The fabrication and characterization of surface-functionalized microstructures : monolayers as precursors to molecular wires." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12484.

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