Дисертації з теми "Phase tensor"
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Kindberg, Katarina. "Regional Kinematics of the Heart: Investigation with Marker Tracking and with Phase Contrast Magnetic Resonance Imaging." Thesis, Linköping University, Department of Biomedical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1735.
Повний текст джерелаThe pumping performance of the heart is affected by the mechanical properties of the muscle fibre part of the cardiac wall, the myocardium. The myocardium has a complex structure, where muscle fibres have different orientations at different locations, and during the cardiac cycle, the myocardium undergoes large elastic deformations. Hence, myocardial strain pattern is complex. In this thesis work, a computation method for myocardial strain and a detailed map of myocardial transmural strain during the cardiac cycle are found by the use of surgically implanted metallic markers and beads. The strain is characterized in a local cardiac coordinate system. Thereafter, non-invasive phase contrast magnetic resonance imaging (PC-MRI) is used to compare strain at different myocardial regions. The difference in resolution between marker data and PC-MRI data is elucidated and some of the problems associated with the low resolution of PC-MRI are given.
Okazaki, Tomohisa. "Characteristics of Electrical Anisotropy in Magnetotelluric Responses." Kyoto University, 2018. http://hdl.handle.net/2433/232256.
Повний текст джерелаHeeren, Janna Eva Kathrina [Verfasser]. "Diffusion Tensor Imaging und neuropsychologische Testungen zur Diagnostik des idiopathischen Parkinson-Syndroms während der prämotorischen Phase / Janna Eva Kathrina Heeren." Lübeck : Zentrale Hochschulbibliothek Lübeck, 2019. http://d-nb.info/1179305183/34.
Повний текст джерелаLiu, Meishuai. "Study on microstructural and crystallogarphic characteristics of phase transformation induced by ECP in annealed Cu-40%Zn alloy." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0210.
Повний текст джерелаA thorough investigation has been conducted on the microstructural and crystallographic features of Electric Current Pulse (ECP) treated Cu-40%Zn alloys. The phase transformation orientation relationship (OR) and its correlation with crystal defects have been studied and the formation mechanisms of ECP induced crystal defects in the parent phase and the sub-structures in the β precipitates were also analyzed. The α to β heating phase transformation can be induced by ECP treatment with the formation of fine β precipitates that can be remained to the room temperature. With the increase of the electric current density, the amount of precipitates is increased and the formation sites increase from α grain boundaries to grain interiors. The β precipitates follow different ORs depending on the formation site. The grain boundary β phase obeys the Kurdjumov-Sachs (K-S) OR; whereas the intragranular β respects the Nishiyama-Wasserman (N-W) OR. In the former sites, the {111}α /<11̅0>α dislocations are observed, whereas in the latter, the {111}α/<112̅>α stacking faults are found. Transformation strain analyses revealed that under the K-S OR the maximum lattice deformation required is a shear on the {111}α /<11̅0>α slip system, whereas under the N-W OR the maximum deformation is a shear on the {111}α /<112̅>α system. Thus the existing {111}α /<11̅0>α dislocations along the α grain boundaries provide pre-strain required by the transformation via the K-S path, whereas the {111}α /<112̅>α stacking faultsboarded by {111}α /<112̅>α partial dislocations offer pre-strain facilitating the transformation via the N-W path. Different types of crystal defects are formed in the α matrix by the ECP treatments depending on the current density. At low density, large amount of {111}α /<112̅>α stacking faults and then nano twins are produced in the α matrix. At high density, dislocation nets are formed near the β precipitates that are composed of edge typed {111}α /< 11̅0 >α perfect dislocations and the Frank typed dislocations. The volume misfit between the α and the β phase analyzed with transformation deformation reveals that the transformation from α to β requires an expansion along [11̅0]α direction and a contraction along [111]α direction. The former results in the appearance of the {111}α /<11̅0>α edge typed dislocation arrays in front of the {31̅1}α broad faces and the latter induces the formation of the Frank typed dislocations in front of the {121}α broad faces. Thus, dislocation nets formed along the edges of the broad faces of the β precipitates where the two kinds of dislocations meet. Furthermore, the β precipitates contain two kinds of nano-sized and diffuse atomic clusters with the structure obeying the Burgers OR and with the ω structure obeying the Blackburn OR with the β matrix. They were each formed through a two-stepped atomic displacement. For the structure, the first step is the atomic shuffle of each second {110}β plane in the <11̅0>βdirection and the second is a structure change mainly by a shear on the {11̅2}β /<1̅11>β. For the ω structure, the first is an atomic shuffle on each second and third {112̅}β plane in the ±[111]β directions and then normal strains in three mutually perpendicular directions (<111>β, <112̅>β and <11̅0>β). The concomitant appearance of the two structures lies in the fact that the volume increase accompanying the formation can be canceled by the volume decrease accompanying the ω distortion, which minimizing the transformation strain energy. The results of this work provide fundamental information on the Cu-40%Zn alloys for interpreting the impact of the crystal defects on the solid phase transformation ORs, on the formation of various types of crystal defects induced by the ultra-rapid phase transformation and on the formation mechanisms of sub structures in the product phase
McKee, Justin. "A phase II randomised controlled trial of amiloride as a neuroprotective treatment in optic neuritis : studying in vivo neurodegeneration, neuroprotection and cortical plasticity after an inflammatory insult to the visual system." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:824ca36c-68ed-4b0c-90dc-925941ce9450.
Повний текст джерелаJiang, Shenghan. "Symmetric topological phases and tensor network states:." Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107410.
Повний текст джерелаClassification and simulation of quantum phases are one of main themes in condensed matter physics. Quantum phases can be distinguished by their symmetrical and topological properties. The interplay between symmetry and topology in condensed matter physics often leads to exotic quantum phases and rich phase diagrams. Famous examples include quantum Hall phases, spin liquids and topological insulators. In this thesis, I present our works toward a more systematically understanding of symmetric topological quantum phases in bosonic systems. In the absence of global symmetries, gapped quantum phases are characterized by topological orders. Topological orders in 2+1D are well studied, while a systematically understanding of topological orders in 3+1D is still lacking. By studying a family of exact solvable models, we find at least some topological orders in 3+1D can be distinguished by braiding phases of loop excitations. In the presence of both global symmetries and topological orders, the interplay between them leads to new phases termed as symmetry enriched topological (SET) phases. We develop a framework to classify a large class of SET phases using tensor networks. For each tensor class, we can write down generic variational wavefunctions. We apply our method to study gapped spin liquids on the kagome lattice, which can be viewed as SET phases of on-site symmetries as well as lattice symmetries. In the absence of topological order, symmetry could protect different topological phases, which are often referred to as symmetry protected topological (SPT) phases. We present systematic constructions of tensor network wavefunctions for bosonic symmetry protected topological (SPT) phases respecting both onsite and spatial symmetries
Mickel, Walter. "Geometry controlled phase behavior in nanowetting and jamming." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00868861.
Повний текст джерелаDandekar, Abhijit Yeshwant. "Interfacial tension and viscosity of reservoir fluids." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1397.
Повний текст джерелаSantos, Fernando Luiz Pio dos. "Simulação numérica de escoamentos multifásicos utilizando o sistema FreeFlow-2D." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-11122001-173103/.
Повний текст джерелаThis work describes a method to expand the applicability of the system FreeFlow-2D in multi-phase flows problems. This method allows the simulation of incompressible free surface multi-phase flows. An arbitrary number of phases having different properties can be used. Surface and interface tension effects are also considered. The numerical technique is based on the GENSMAC (Generalized-Simplified-Marker-and-Cell) and it considers the properties varying according to the position of the interfaces in the flow. The velocity field is computed using the Navier-Stokes equations discretized by finite-difference on stagered grid. The method was implemented in three modules: the modeling module, the simulation module, and the visualization module. The validation was effected by comparing numerical results with analytical and experimental results. The method shown to be robust and computationally efficient in the problems considered.
Braun, Frank Nicholas. "Surface phase transitions in liquid crystals." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242564.
Повний текст джерелаLervåg, Karl Yngve. "Simulation of two-phase flow with varying surface tension." Thesis, Norwegian University of Science and Technology, Department of Mathematical Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9738.
Повний текст джерелаThis thesis is a study on the effects of varying surface tension along an interface separating two fluids. Varying surface tension leads to tangential forces along the interface. This is often called the Marangoni effect. These forces are discussed in detail, and two test cases are considered to analyse the Marangoni effect, and to verify the present implementation. The first test studies steady-state two-phase flow where the fluids are separated with plane interfaces and the flow is driven by a linear surface-tension gradient. The second case is an analysis of the initial forces on a two-dimensional droplet due to a linear surface-tension gradient. The tests indicate that the present implementation is capable of simulating two-phase flow with a given surface-tension gradient. The underlying model is a two-phase flow model for Newtonian fluids with constant viscosity and density. The two-phase model is based on the Navier-Stokes equations coupled with a singular surface force, which together with the difference in fluid properties induces discontinuities across the interface. The Navier-Stokes equations are solved using a projection method, and a combination of the level-set method for capturing the interface and the ghost-fluid method (GFM) for handling the interface discontinuities. The thesis also discusses the effect of surfactants on an interface. The presence of surfactants reduces the local surface tension, and a non-uniform surfactant distribution results in varying surface tension and the Marangoni effect. A surfactant model is reviewed, where an equation of state couples the surface tension to the surfactant concentration and a transport equation is used to solve the surfactant mass-conservation.
Albernaz, Daniel. "Phase change, surface tension and turbulence in real fluids." Doctoral thesis, KTH, Fysiokemisk strömningsmekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183487.
Повний текст джерелаQC 20160314
Alves, Júnior Francisco Artur Pinheiro. "Modelos cosmológicos numa teoria geométrica escalar - tensorial da gravitação: aspectos clássicos e quânticos." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/9539.
Повний текст джерелаMade available in DSpace on 2017-09-18T11:29:37Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1956067 bytes, checksum: 845c3d0cd5113c8498d955af9cdcd907 (MD5) Previous issue date: 2016-09-27
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In this thesis, we deal with a particular geometric scalar tensor theory, which is a version of the Brans-Dicke gravitation, formulated in aWeyl integrable space-time. This formulation is done using the Palatini's variation procedure. The main point of our work is to perform two particular applications of the geometrical Brans-Dicke theory. The rst one is the study of geometric fase transition phenomena, that's related to a continuous change in the space-time structure of the universe from a Riemann's geometry to a Weyl's geometry, or in the inverse sense, from Weyl's geometry to Riemann's geometry. This phenomena seems to take place when the universe starts to expand in a accelerated rate. The second one is the investigation of classical and quantum behaviour of a anisotropic n-dimensional universe . To nd solutions that display the dynamical compacti cation of non observed extra dimensions is the main motivation to study such universe.
Nesta tese, reapresentamos uma teoria escalar tensorial geométrica, que é uma versão da gravitação de Brans-Dicke formulada em um espaço-tempo de Weyl integrável. Com esta teoria fazemos duas aplicações especí cas. Uma delas para o estudo de um fenômeno, que chamamos de transição de fase geométrica, uma mudança contínua na estrutura geom étrica do espaço-tempo. Este fenômeno parece ocorrer quando o universo se expande aceleradamente. A segunda aplicação reside no estudo clássico e quântico do comportamento de um modelo de universo n-dimensional anisotrópico. A motivação para esta investigação é a busca de soluções que exibem o compactação dinâmica das dimensões extras, que não são observadas.
Stoyanov, Simeon. "Theory and simulation of interfacial effects and phase behavior of nonionic surfactants." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967284503.
Повний текст джерелаAbdel-Rahem, Rami. "Phase behavior and structural transitions in the mixtures of cationic surfactants and hydrophobic counterions." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969146299.
Повний текст джерелаDENIZART, MARIE-ODILE. "Anomalies du profil tensionnel a la phase aigue de l'accident vasculaire cerebral." Aix-Marseille 2, 1993. http://www.theses.fr/1993AIX20111.
Повний текст джерелаShweikeh, Jamal Fahmi. "Interfacial tension and phase behaviour of nitrogen and hydrocarbon vapour-liquid systems." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309874.
Повний текст джерелаBrooks, Jason Travis. "Polymers in surfactant mesophases." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259541.
Повний текст джерелаCollaudin, Aurelie. "Tenseur de mobilité et magnétothermoélectricité anisotrope de bismuth." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066630/document.
Повний текст джерелаBismuth Fermi surface is composed of one parabolic hole pocket and three equivalent Dirac electrons valleys. The electrons effective mass is low (m* ~ 10-3 me) and very anisotropic (m1 ~ 200 m2). These exceptional electronic properties, combined with a very low carrier density (n=3.10-17 cm-3) and a very large mobility (µ ~ 108 cm2/V/s) imply that bismuth magnetoresistance is very large and very sensitive to the orientation of the magnetic field. During this thesis, we mapped in temperature and magnetic field the angular dependence of transverse magnetoresistance in the three high symmetry planes. Our datas are then fitted by a semi-classical model. This permits to examine the relevance of the semi-classical theory and to extract the mobility tensors components. We find that all mobility tensor components have a temperature dependence close to a T-2, which suggests that the electron-electron interaction is the main diffusion mechanism. At low temperature and high magnetic field, a phase transition induces the loss of the lattice rotational symmetry in angular dependence magnetoresistance measurement. The angular dependence of magneto-Seebeck effect shows the same oscillations as magnetoresistance. Their explanation requires to go beyond the semi-classical model. Finally, magnetic field dependence and anisotropy of thermoelectric power and thermoelectric figure of merit of pure bismuth and a bismuth-antimony alloy are studied
Wu, Dongmin. "Influence of phase orientation on dynamic interfacial tension measured by drop volume tensiometry." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq22021.pdf.
Повний текст джерелаYahaya, A. A. "Experimental investigation of interfacial tension in two-phase system involving methane and water." Thesis, University of Salford, 2018. http://usir.salford.ac.uk/48762/.
Повний текст джерелаGenuit, Daisy. "Développement d'une nouvelle génération de catalyseurs d'hydrotraitement à haute teneur en phase active." Lyon 1, 2005. http://www.theses.fr/2005LYO10144.
Повний текст джерелаRannou, Guillaume. "Lattice-Boltzmann method and immiscible two-phase flow." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26560.
Повний текст джерелаCommittee Chair: Cyrus K. Aidun; Committee Member: Marc K. Smith; Committee Member: S. Mostafa Ghiaasiaan. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Gouraud, Fanny. "Influence des transformations de phase de la zircone sur le comportement thermomécanique de réfractaires à très haute teneur en zircone." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0110/document.
Повний текст джерелаThis thesis, carried out under the research program ASZTech, focuses on the study of two fused cast refractories: an Alumina-Zirconia-Silica (AZS) product and a product with very High content of Zirconia (HZ), used in glass industry. These refractories containing non-stabilized zirconia are therefore subjected, during the annealing step (cooling), to the tetragonal (T) to the monoclinic (M) phase transition of zirconia associated with a very high volumetric expansion which is a source of stresses. This study aims at characterizing, during representative thermal treatments, the thermo-mechanical behavior of these materials, in correlation with the detected microstructural evolutions. Thanks to the analysis of their behavior under thermal stresses by acoustic techniques, the effect of the T-M transition of zirconia on the development of damage has been highlighted. In particular, the occurrence of a TRansformation Induced Plasticity (TRIP) phenomenon during the zirconia phase transition has been identified and characterized thanks to cooling tests under mechanical stress. In addition to this TRIP phenomenon which allows to relax the mechanical stresses induced during the phase transition, a diffuse damage phenomenon has been also identified for HZ product. Eventually, these data have led to an improvement of the numerical model which simulates the annealing step of industrial blocks. Moreover, the reliability of this model will be now checked by comparison to experimental measurements of residual stresses performed during this study
Maussion, Pascal. "Commande numérique d'un onduleur de tension en modulation de largeur d'impulsion sur charges non linéaires." Toulouse, INPT, 1990. http://www.theses.fr/1990INPT095H.
Повний текст джерелаFreyer, Burkhard Heinrich. "Gauge and tension control during the acceleration phase of a steckel hot rolling mill." Diss., University of Pretoria, 2002. http://hdl.handle.net/2263/24580.
Повний текст джерелаDissertation (M Eng (Electronic Engineering))--University of Pretoria, 2002.
Electrical, Electronic and Computer Engineering
MEng
unrestricted
Müller, Pierre. "Phase ordonnee anisotrope dans un film de langmuir : morphologie, croissance et tension de ligne." Paris 6, 1991. http://www.theses.fr/1991PA066588.
Повний текст джерелаWouts, Marc. "Le modèle d'Ising dilué : coexistence de phases à l'équilibre & dynamique dans la région de transition de phase." Phd thesis, Université Paris-Diderot - Paris VII, 2007. http://tel.archives-ouvertes.fr/tel-00272899.
Повний текст джерелаLa thèse comporte quatre chapitres. Dans un premier chapitre, nous adaptons les travaux de Pisztora au cas du milieu aléatoire et établissons une procédure de renormalisation compatible avec la dilution. Dans un second chapitre, nous étudions en détail la tension superficielle de ce modèle, pour la mesure de Gibbs correspondant à un milieu fixé, et pour la mesure moyennée. Nous caractérisons la limite à basse température de chacune de ces quantités et décrivons les formes des cristaux correspondants. Nous montrons que les déviations inférieures de la tension superficielle ont un coût surfacique et donnons une borne inférieure sur la fonction de taux à l'aide de méthodes de concentration de la mesure. Dans un troisième chapitre, nous décrivons le phénomène de coexistence de phases, sous la mesure Gibbs et sous la mesure moyennée. Dans un quatrième et dernier chapitre, nous concluons la thèse avec une application à la dynamique de Glauber, et montrons que l'autocorrélation décroît au plus vite comme une puissance inverse du temps.
Alhendal, Yousuf A. "Computational two phase Marangoni flow in a microgravity environment." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html.
Повний текст джерелаAlibrahim, Moussa. "Systèmes à base de tensio-actifs non ioniques : Influence de co-tensio-actifs ioniques et structure des phases mésomorphes." Nancy 1, 1988. http://www.theses.fr/1988NAN10061.
Повний текст джерелаAlibrahim, Moussa. "Systèmes à base de tensio-actifs non ioniques influence de co-tensio-actifs ioniques et structure des phases mésomorphes /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37611204r.
Повний текст джерелаNeto, Eduardo Lins de Barros. "Extraction liquide-liquide à deux phases aqueuses : systèmes phénol tensio-actifs polyéthoxylés." Toulouse, INPT, 1999. http://www.theses.fr/1999INPT00LG.
Повний текст джерелаGros, Alice. "Modélisation de la cristallisation sous tension du caoutchouc naturel." Thesis, Ecole centrale de Nantes, 2016. http://www.theses.fr/2016ECDN0018.
Повний текст джерелаDespite the numerous experimental inverstigations performed over the past century and more intensively in the last fifteen years, strain-induced crystallization taking place in natural rubber still remains hardly understood in its precise mechanisms, leading models to remain phenomenological ones. The present study aims to develop a physicallymotivated model which qualitatively reproduces physical phenomena observed during an uniaxial tensile test. Firstly, the amorphous network is assumed to deform in an equal-force manner, resulting in a representative chain encompassing the inhomogeneity of matter through the chain-length distribution. Secondly, based on classical thermodynamics and on the entangled nature of the polymer network, both crystallization and fusion conditions are established. Moreover the derivation of the equilibrium point of a finite crystallite in a deformed network clarifies the tight relation between deformation and temperature during fusion. Finally, a semi-crystallized chain is defined, accounting for both the inhomogeneity of the amorphous phase and the heterogeneity due to the presence of a crystalline phase. This chain is included in a modified full-network model, initially dedicated to amorphous networks. This work leads to a complete thermo-mechanical constitutive equation which qualitatively reproduces the response of natural rubber in tension, but also to an original interpretative description of strain-induced crystallization
Mora, Torres Rocio. "Recherche de résidus d'un fongicide chloré (le pentachloronitrobenzène) dans les végétaux et les sols : étude des moyens de biodégradation." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE18013.
Повний текст джерелаEch, Cheikh Fouad. "Modélisations numérique et analytique du comportement mécanique et multiphysique d'une phase haute-tension pour fermes offshores." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0004.
Повний текст джерелаOTDR-based electrical cable diagnostic methods exist that allow the detection and localization of faults, but the analysis of the measured signals needs to be improved, particularly through the use of models. The link between the physical degradation of the cable and the values of the electrical parameters has, to our knowledge, never yet been realized. As a result, we are not able to know the actual condition of the cable in its natural evolution environment, let alone its residual life. The work carried out in this thesis aims at studying the mechanical behavior in both quasistatic and cyclic fatigue loadings in order to correlate the deformation levels reached to the operating mechanisms of damage and which reflect the proliferation of microstructural defects within the components of the phase (Conductor and insulators). To do this, we propose a numerical modeling using Abaqus. Then, again using numerical modeling, this time using Comsol, we tried to show the impact of mechanical damage on the physical properties (electrical and thermal) of the phase, emphasizing the role of copper. Insulators are playing a key role as well. However, the contour of the thesis had to be well defined in accordance with the time allocated and it seemed to us that a lot of information can be got out of the study of the conductor
Patapy, Cédric. "Comportement thermomécanique et transformations de phase de matériaux réfractaires électrofondus à très haute teneur en zircone." Limoges, 2010. https://aurore.unilim.fr/theses/nxfile/default/d84e3b5f-5f40-4ad8-a7ca-37c82c1ee360/blobholder:0/2010LIMO4047.pdf.
Повний текст джерелаThis thesis has been carried out under the National Program of Research on new glass refractories (NOREV), focusing on the study of two shades of refractories with a very high content of zirconia (THTZ) obtained by a fused-cast process. The objective was to understand the microstructural mechanisms responsible for changes in mechanical properties of these materials during the annealing step (controlled cooling after melting), and to assess the influence of composition their glassy phase. A detailed study of the microstructure inherited from the solidification mechanisms and successive runs of phase transformations of zirconia has helped to explain the origin of different heterogeneities present within a block and to reveal the complexity of the multi-scaled organization of THTZ materials (selection of crystallographic variants). The study of elastic properties by ultrasonic techniques during a heat treatment at 1500°C, showed the significant influence of the transformation from tetragonal → monoclinic martensitic transformation of zirconia and the stiffening of the glassy phase on the mechanical behavior of materials, including the development of damage at the end of the cycle. Moreover, tensile and compressive tests performed during a cooling stage, have highlighted the higher viscous-plastic behavior at high temperature of THTZ-B compared to THTZ-A. This follows a very different evolution of viscosities of the two glassy phases. Furthermore, the relationship between the stress field in this block during the annealing, and local crystallographic organization of the material was studied, in particular, by cooling under stress tests
Hulin, Claudie. "Couplage géochimie-géomécanique dans les milieux poreux insaturés : Tension capillaire – Pression de cristallisation." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2028/document.
Повний текст джерелаThe alteration of porous media in drying conditions is generally attributed to the pressure exerted by growing salts from the poral evaporating solution against the pore wall (crystallization pressure). In drying conditions, the water retained by capillarity in nanometric pores is under absolute negative pressure. Water under capillary tension exerts a mechanical traction against the pore walls but also modifies the chemical equilibria and so rock-fluid interactions. Crystallization pressure and capillary tension, which are physical processes, are both induces by the disequilibrium between poral water and dry air.Salt crystallization experiments in microtubes (Na2SO4, NaCl) show some favorable conditions for crystallization pressure - in terms of supersaturation and geometry – which is transient and brutal. A second series of experiments shows that capillary tension, generated by a nanometric liquid air interface, can be transmitted to a macrovolume of aqueous solution in a particular geometric system built with salts. The tensile state is metastable (superheated), but long enough to modify significantly the chemical budget of the system and to see mechanical effects. The brutal relaxation of the superheating state by vapor nucleation induces a rapid salt supersaturation which is the driving force of the crystallization pressure.The salt growth (during evaporation) and capillarity cooperate in drying conditions to alter porous media.During climate cycles (especially humidity) they control and induce transient and brutal events which mark the end of metastable states (superheating and salt supersaturation)
Oomar, Muhammad Yusufali. "A Volume of Fluid (VoF) based all-mach HLLC Solver for Multi-Phase Compressible Flow with Surface-Tension." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33935.
Повний текст джерелаAllam, Mootaz Bellah Mohamed Mahmoud. "Convertisseur analogique-numérique ΣΔ à base VCO". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066299.
Повний текст джерелаToday's wireless communication systems are requiring high performance Converters analog-digital (ADC) with increasing demand on bandwidth and resolution.There is a growing need for low-power and multi-functional RF receivers , since the market is expecting complex receiving capacities with low power battery operated devices.For this reason the current trend is to decrease the analogue part of the receivers, while increasing the tasks performed by the digital part.Therefore, this imposes stringent requirements on the ADC such as wideband operation, high resolution and low power consumption.In this dissertation, we studied and realized several types of VCO-based ADCs.We show the design, implementation and the measurements of two types of VCO-based ADCs in 65nm CMOS process. The first is using the voltage to frequency conversion technique while the second uses the principle of voltage to phase conversion.The voltage to frequency converter is a 4-bit ADC with a programmable sampling frequency that goes from 220MHz up to 1500MHz.The measured Signal-to-noise-and-distortion-ratio (SNDR) is of 40.5dB in a band of 30MHz with a power consumption of 0.5mW.The voltage phase converter is a 4-bit ADC with a programmable sampling frequency that goes from 300MHz up to 1440MHz.The measured SNDR is 48dB in a band of 30MHz with a consumption of 1mW.We then present a systematic design method of high order SigmaDelta ADCs with VCO-based quantizers.To validate the design method, a SigmaDelta ADC with a 4-bit voltage-frequency is designed in 65nm. The measured SNDR is 62dB in a band of 28MHz and a power consumption of 30mw.We propose the use of VCO-based quantizers in quadrature SigmaDelta modulators. A systematic design method is presented for the quadrature VCO-based Sigmadelta modulators.A 4th order quadrature sigmadelta with 4-bit voltage to frequency quantizers is designed in 65nm. The measurements of this circuit are currently in progress. In post layout simulations, the quadrature modulator achieves 75dB in a band of 40MHz and a power consumption of 60mW
Razakarison, Monique Yvonne. "L'Adsorption sur une silice précipitée de quelques polyoxyéthylène glycols et d'un tensio-actif homologué en phase aqueuse." Montpellier 2, 1990. http://www.theses.fr/1990MON20024.
Повний текст джерелаRapolu, Prakash. "Capillarity Effect on Two-phase Flow Resistance in Microchannels." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204082574.
Повний текст джерелаKolb, William Blake. "The coating of monolithic structures analysis of flow phenomena /." Access abstract and link to full text, 1993. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9318176.
Повний текст джерелаGarcia, Diez Leticia. "Mizellare Chromatographie und selektive Ultrafiltration zur Trennung von Aminosäureracematen /." Aachen : Shaker, 2008. http://d-nb.info/98929837X/04.
Повний текст джерелаSchweizer, Martin. "Fractionnement et identification de petits peptides issus de l'hydrolyse enzymatique des protéines de colza." Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL016N.
Повний текст джерелаDupouy, Emmanuel. "Etude et réalisation d’un oscillateur bande X, contrôlé en tension, à varactor MEMS, pour application spatiale." Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/0a7b6cfb-c69f-4fd5-bc50-364c054aa7c4/blobholder:0/2009LIMO4006.pdf.
Повний текст джерелаThis research work is dedicated to the design and realization of a 10 GHz voltage controlled oscillator. A feasibility study of the oscillator using MEMS varactor to control the oscillation frequency is realized. First chapter presents analysis methods enabling to simulate accurately all of circuit electrical characteristics before its realization : start-up conditions, steady-state and phase noise analysis. Second chapter presents the non linear modeling of the SiGe heterojonction bipolar transistor used to design the oscillator. Second part of this chapter shows low frequency noise modeling of this transistor, since it’s the major contribution of phase noise near the carrier. Thrid Chapter is devoted to the design of the final oscillator. The different design steps using tools presented in the first chapter and models presented in the second chapter are explained. This work leads to the realization of a fixed frequency oscillator and a voltage controlled oscillator respectively reaching phase noise of -119 dBc/Hz and -115 dBc/Hz @ 100 kHz from the carrier
Rogez, Daniel. "Contribution à l'étude des propriétés tensio-actives des copolymères séquencés poly(styrène-b-oxyde d'éthylène) : application à la préparation d'émulsions et de latex." Mulhouse, 1987. http://www.theses.fr/1987MULH0039.
Повний текст джерелаHyvert, Jérémy. "Techniques de conception d'oscillateurs contrôlés en tension à très faible bruit de phase en bande Ku intégrés sur silicium en technologie BiCMOS." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2281/document.
Повний текст джерелаThe thesis goal is to demonstrate the feasibility of voltage controlled oscillator (VCO) challenging the VCOs using III-V technologies regarding phase noise performances. This VCO must be fully integrated, target the Ku-band and use the QUBiC4X process from NXP Semiconductors. This thesis work is based on three main chapters, the first one reviews the fundamentals to understand the intrinsic phenomena in electronics components and more particularly in oscillators. The second explains, by using the waveforms analysis and analytical demonstrations, the choices made regarding both the active part and the resonator architecture in order to minimize the AM/PM noise conversion and then to reach the best phase noise performances. It describes the four versions of the realized VCOs and analyzes the post-layout simulations results to justify their fabrications. It shows more specifically an innovative architecture using the advantages of a cascode configuration and a resonator based on three interlocked differential inductors. Finally, the third chapter focuses on the masks' layout and measurements results of the four VCOs. It also details the investigations made to explain the differences between measurements and simulations
ZOU, LU. "HYDRODYNAMICS AND LINE TENSION OF LANGMUIR FILMS AT THE AIR-WATER INTERFACE." Kent State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=kent1195625894.
Повний текст джерелаMazet, Stéphane. "Conception et réalisation d'oscillateurs contrôlés en tension à faible bruit de phase pour des systèmes de télécommunications spatiales." Limoges, 2003. http://www.theses.fr/2003LIMO0035.
Повний текст джерелаMaeda, Nobuo, and nobuo@engineering ucsb edu. "Phase Transitions of Long-Chain N-Alkanes at Interfaces." The Australian National University. Research School of Physical Sciences and Engineering, 2001. http://thesis.anu.edu.au./public/adt-ANU20011203.151921.
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