Relevant bibliographies by topics / Surface homogenization

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Surface homogenization'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Surface homogenization"

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Mohammadi, P., L. P. Liu, P. Sharma, and R. V. Kukta. "Surface energy, elasticity and the homogenization of rough surfaces." Journal of the Mechanics and Physics of Solids 61, no. 2 (February 2013): 325–40. http://dx.doi.org/10.1016/j.jmps.2012.10.010.

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Ye, Aiqian, Skelte G. Anema, and Harjinder Singh. "Changes in the surface protein of the fat globules during homogenization and heat treatment of concentrated milk." Journal of Dairy Research 75, no. 3 (July 14, 2008): 347–53. http://dx.doi.org/10.1017/s0022029908003464.

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The changes in milk fat globules and fat globule surface proteins of both low-preheated and high-preheated concentrated milks, which were homogenized at low or high pressure, were examined. The average fat globule size decreased with increasing homogenization pressure. The total surface protein (mg m−2) of concentrated milk increased after homogenization, the extent of the increase being dependent on the temperature and the pressure of homogenization, as well as on the preheat treatment. The concentrates obtained from high-preheated milks had higher surface protein concentration than the concentrates obtained from low-preheated milks after homogenization. Concentrated milks heat treated at 79°C either before or after homogenization had greater amounts of fat globule surface protein than concentrated milks heat treated at 50 or 65°C. This was attributed to the association of whey protein with the native MFGM (milk fat globule membrane) proteins and the adsorbed skim milk proteins. Also, at the same homogenization temperature and pressure, the amount of whey protein on the fat globule surface of the concentrated milk that was heated after homogenization was greater than that of the concentrated milk that was heated before homogenization. The amounts of the major native MFGM proteins did not change during homogenization, indicating that the skim milk proteins did not displace the native MFGM proteins but adsorbed on to the newly formed surface.
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McCrae, Catharina H., David Hirst, Andrew J. R. Law, and D. Donald Muir. "Heat stability of homogenized milk: role of interfacial protein." Journal of Dairy Research 61, no. 4 (November 1994): 507–16. http://dx.doi.org/10.1017/s0022029900028430.

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SummaryThe role of interfacial protein in determining the heat stability of recombined milk was investigated by removing serum protein prior to homogenization and reincorporating it after homogenization. In addition, the surface protein composition of recombined fat globules was probed by analyses of protein load and by quantification of the individual surface protein components using FPLC. In the absence of serum protein, substantially more casein was bound to the fat surface during homogenization. Despite this, the detrimental effect of homogenization on heat stability did not occur when serum protein had been removed from the system. Reincorporation of serum protein after homogenization caused the heat coagulation time–pH profile to revert to a form very similar to that observed without removing serum protein from the system. Thus, adsorption of serum protein did not affect heat stability. It is more likely that heat-induced interactions of serum protein with surface-adsorbed casein promoted heat coagulation. Fat surface area rather than casein load affected these interfacial protein-protein interactions during heating.
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Alberti, Giovanni, and Antonio DeSimone. "Wetting of rough surfaces: a homogenization approach." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 461, no. 2053 (January 8, 2005): 79–97. http://dx.doi.org/10.1098/rspa.2004.1364.

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The contact angle of a drop in equilibrium on a solid is strongly affected by the roughness of the surface on which it rests. We study the roughness–induced enhancement of the hydrophobic or hydrophilic properties of a solid surface through homogenization theory. By relying on a variational formulation of the problem, we show that the macroscopic contact angle is associated with the solution of two cell problems, giving the minimal energy per unit macroscopic area for a transition layer between the rough solid surface and a liquid or vapour phase. Our results are valid for both chemically heterogeneous and homogeneous surfaces. In the latter case, a very transparent structure emerges from the variational approach: the classical laws of Wenzel and Cassie–Baxter give bounds for the optimal energy, and configurations of minimal energy are those leading to the smallest macroscopic contact angle in the hydrophobic case, to the largest one in the hydrophilic case.
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SOLCI, MARGHERITA. "HOMOGENIZATION OF ENERGIES DEFINED ON PAIRS SET-FUNCTION." Communications in Contemporary Mathematics 11, no. 03 (June 2009): 459–79. http://dx.doi.org/10.1142/s0219199709003442.

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In the present work, we deal with the problem of the asymptotic behavior of a sequence of non-homogeneous energies depending on a pair set-function of the form [Formula: see text] with u ∈ H1(Ω), E regular open set and the energy densities f and φ both 1-periodic in the first variable; this leads, in the Γ-limit, to a problem of homogenization. We prove a Γ-convergence result for the sequence {Fε}, showing that there is no interaction between the homogenized bulk and surface energy density; that is, even though the effect of the bulk and surface energies are at the same energy scale, oscillations in the bulk term can be neglected close to the surfaces ∂*E and S(u), where surface oscillations are dominant.
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Kang, Ho Jin, Shin Ho Kang, and Yong Kook Shin. "Prediction of Homogenization Efficiency using Response Surface Methodology." Journal of Milk Science and Biotechnology 35, no. 3 (September 2017): 202–7. http://dx.doi.org/10.22424/jmsb.2017.35.3.202.

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Hergarten, Stefan, and Horst J. Neugebauer. "homogenization of Manning's Formula for modeling surface runoff." Geophysical Research Letters 24, no. 8 (April 15, 1997): 877–80. http://dx.doi.org/10.1029/97gl00756.

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Duncan, Andrew B. "Homogenization of Lateral Diffusion on a Random Surface." Multiscale Modeling & Simulation 13, no. 4 (January 2015): 1478–506. http://dx.doi.org/10.1137/140951436.

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Wang, Kuan-Wen, Shu-Ru Chung, and Tsong-Pyng Perng. "Surface segregation and homogenization of Pd70Ag30 alloy nanoparticles." Journal of Alloys and Compounds 422, no. 1-2 (September 2006): 223–26. http://dx.doi.org/10.1016/j.jallcom.2005.12.009.

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Si, Peng, Chuanjun Luo, and Min Wang. "Homogenization of Surface Pressure Data in Tianjin, China." Journal of Meteorological Research 33, no. 6 (December 2019): 1131–42. http://dx.doi.org/10.1007/s13351-019-9043-8.

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Dissertations / Theses on the topic "Surface homogenization"

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Reese, Owein. "Homogenization of acoustic wave propagation in a magnetorheological fluid." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0430104-101629.

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Nika, Grigor. "Multiscale analysis of emulsions and suspensions with surface effects." Digital WPI, 2016. https://digitalcommons.wpi.edu/etd-dissertations/146.

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The better understanding of the behavior of emulsions and suspensions is important in many applications. In general, emulsions allow the delivery of insoluble agents to be uniformly distributed in a more efficient way. At the same time suspensions of rigid particles are used as “smart materialsâ€� as their properties can be changed by the interaction with a magnetic or electric field. In the first part of the talk we consider a periodic emulsion formed by two Newtonian fluids in which one fluid is dispersed under the form of droplets of arbitrary shape, in the presence of surface tension. We assume the droplets have fixed centers of mass and are only allowed to rotate. We are interested in the time-dependent, dilute case when the characteristic size of the droplets aε, of arbitrary shape, is much smaller than the period length ε. We obtain a Brinkman type of fluid flow for the critical size aε = O(ε3) as a replacement of the Stokes flow of the emulsion. Additionally, using Mosco convergence and semigroup theory we extend the convergence to the parabolic case. For the case when the droplets convect with the flow, it can be shown again using Mosco-convergence that, as the size of the droplets converges to zero faster than the distance between the droplets, the emulsion behaves in the limit like the continuous phase and no “strangeâ€� term appears. Moreover, we determine the rate of convergence of the velocity field for the emulsion to that of the velocity for the one fluid problem in both the H1 and L2 norms. Additionally, a second order approximation is determined in terms of the bulk and surface polarization tensors for the cases of uniform and non-uniform surface tension. The second part of the talk is devoted to the study of MR fluids. We consider a suspension of rigid magnetizable particles in a non-conducting, viscous fluid with an applied external magnetic field. Thus, we use the quasi-static Maxwell equations coupled with the Stokes equations to capture the magnetorheological effect. We upscale using two scale asymptotic expansions to obtain the effective equations consisting of a coupled nonlinear system in a connected phase domain as well as the new constitutive laws. The proposed model generalizes the model of Rosenweig by coupling the velocity of the fluid and the magnetic field intensity. Using the finite element method we compute the effective coefficients for the MR fluid. We analyze the resulting MR model for Poiseuille and Couette flows and compare with experimental data for validation.
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Fabricius, John. "Homogenization of some problems in hydrodynamic lubrication involving rough boundaries." Doctoral thesis, Luleå tekniska universitet, Matematiska vetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25734.

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This thesis is devoted to the study of some homogenization problems with applications in lubrication theory. It consists of an introduction, five research papers (I–V) and a complementary appendix.Homogenization is a mathematical theory for studying differential equations with rapidly oscillating coefficients. Many important problems in physics with one or several microscopic scales give rise to this kind of equations, whence the need for methods that enable an efficient treatment of such problems. To this end several mathematical techniques have been devised. The main homogenization method used in this thesis is called multiscale convergence. It is a notion of weak convergence in  Lp spaces which is designed to take oscillations into account. In paper II we extend some previously obtained results in multiscale convergence that enable us to homogenize a nonlinear problem with a finite number of microscopic scales. The main idea in the proof is closely related to a decomposition of vector fields due to Hermann Weyl. The Weyl decomposition is further explored in paper III.Lubrication theory is devoted to the study of fluid flows in thin domains. More generally, tribology is the science of bodies in relative motion interacting through a mechanical contact. An important aspect of tribology is to explain the principles of friction, lubrication and wear. The mathematical foundations of lubrication theory are given by the Navier–Stokes equation which describes the motion of a viscous fluid. In thin domains several simplifications are possible, as shown in the introduction of this thesis. The resulting equation is named after Osborne Reynolds and is much simpler to analyze than the Navier--Stokes equation.The Reynolds equation is widely used by engineers today. For extremely thin films, it is well-known that the surface micro-topography is an important factor in hydrodynamic performance. Hence it is important to understand the influence of surface roughness with small characteristic wavelengths upon the solution of the Reynolds equation. Since the 1980s such problems have been increasingly studied by homogenization theory. The idea is to replace the original equation with a homogenized equation where the roughness effects are “averaged out”. One problem consists of finding an algorithm for computing the solution of the homogenized equation. Another problem consists of showing, on introducing the appropriate mathematical definitions, that the homogenized equation is the correct method of averaging. Papers I, II, IV and V investigate the effects of surface roughness by homogenization techniques in various situations of hydrodynamic lubrication. To compare the homogenized solution with the solution of the deterministic Reynolds equation, some numerical examples are also included.
Godkänd; 2011; 20110408 (johfab); DISPUTATION Ämnesområde: Matematik/Mathematics Opponent: Professor Guy Bayada, Institut National des Sciences Appliquées de Lyon (INSA-LYON), Lyon, France, Ordförande: Professor Lars-Erik Persson, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Tid: Tisdag den 7 juni 2011, kl 10.00 Plats: D2214/15, Luleå tekniska universitet
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Lebihain, Mathias. "Large-scale crack propagation in heterogeneous materials : an insight into the homogenization of brittle fracture properties." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS522.

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La compréhension du comportement macroscopique d'un matériau à partir de la donnée de ses constituants à l'échelle microscopique a toujours été le Saint Graal en science des matériaux dans la mesure où elle fournit les éléments essentiels à la prédiction de la résistance d'une structure et au développement de matériaux aux propriétés innovantes. Si la théorie de l'homogénéisation constitue un cadre théorique établi pour prédire la réponse effective d'une vaste classe de comportements matériaux, elle ne permet pas à l'heure actuelle de prédire les propriétés effectives en rupture fragile. S'attaquer à cette question suppose de tirer profit des caractéristiques uniques de la rupture fragile qui est (i) un problème d'évolution dissipatif, (ii) localisé en pointe de fissure et (iii) relié à un problème de structure. Dans ce travail, nous proposons un formalisme théorique fondé sur une approche perturbative de la mécanique de la rupture afin de (i) modéliser la propagation de fissure dans les milieux désordonnés de grande taille. L'implémentation numérique de ce modèle nous permet (ii) d'étudier en détail les mécanismes dissipatifs mis en jeu en pointe de fissure lorsqu'une fissure interagit avec des hétérogénéités. Leur contribution au renforcement du matériau à l'échelle macroscopique est finalement (iii) estimée à partir de la résolution du problème de structure à l'aide d'outils empruntés à la physique statistique. Les apports théoriques et numériques de la thèse sont finalement confrontés aux résultats d'expériences de fissuration de polymères hétérogènes imprimés 3D, extraits d'outils de corrélation d'image
Being able to predict the macroscopic response of a material from the knowledge of its constituent at a microscopic or mesoscopic scale has always been the Holy Grail pursued by material science, for it provides building bricks for the understanding of complex structures as well as for the development of tailor-made optimized materials. The homogenization theory constitutes nowadays a well-established theoretical framework to estimate the overall response of composite materials for a broad range of mechanical behaviors. Such a framework is still lacking for brittle fracture, which is a dissipative evolution problem that (ii) localizes at the crack tip and (iii) is related to a structural one. In this work, we propose a theoretical framework based on a perturbative approach of Linear Elastic Fracture Mechanics to model (i) crack propagation in large-scale disordered materials as well (ii) the dissipative processes involved at the crack tip during the interaction of a crack with material heterogeneities. Their ultimate contribution to the macroscopic toughness of the composite is (iii) estimated from the resolution of the structural problem using an approach inspired by statistical physics. The theoretical and numerical inputs presented in the thesis are finally compared to experimental measurements of crack propagation in 3D-printed heterogeneous polymers obtained through digital image correlation
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Ruf, Matthias [Verfasser], Marco [Akademischer Betreuer] [Gutachter] Cicalese, Antoine [Gutachter] Gloria, and Andrea [Gutachter] Braides. "Discrete-to-continuum limits and stochastic homogenization of ferromagnetic surface energies / Matthias Ruf ; Gutachter: Antoine Gloria, Marco Cicalese, Andrea Braides ; Betreuer: Marco Cicalese." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1137323493/34.

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Sista, Sri Narasimha Bhargava. "Dry Static Friction in Metals: Experiments and Micro-Asperity Based Modeling." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416579128.

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Zhu, Yu. "Modélisation de structures à haute impédance." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00621152/en/.

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Les Surfaces à Haute Impédance (SHI) ont été largement étudiées pour améliorer toutes sortes de performances des antennes, comme le gain, le facteur de qualité, les formes et dimensions. L'objectif de cette thèse est de modéliser les structures de SHI et de caractériser leurs performances en vue de futures applications aux antennes.Après une brève introduction aux structures SHI et une étude de quelques modèles analytiques fréquemment traités dans la littérature, deux nouvelles méthodes numériques sont proposées pour calculer l'impédance de surface de structures SHI. Ces deux méthodes (dites " méthode du flux de Poynting " et " méthode / ") sont validées sur des structures symétriques, puis mises en service sur des structures de SHI asymétriques. Elles sont également validées par comparaison de résultats analytiques, numériques et expérimentaux.Nous présentons ensuite un modèle équivalent basé sur l'idée de remplacer les structures hétérogènes de SHI par une surface homogène, caractérisée par son impédance surfacique. Ce modèle nous permet d'avoir une prédiction avec un temps de calcul et une occupation de mémoire PC largement réduits.
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Haller, Xavier. "Modélisation du comportement élastique des matériaux nanoporeux : application au combustible UO2." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS232.

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Le dioxyde d'uranium irradié (UO2), combustible nucléaire des réacteurs à eau pressurisée, contient deux populations de cavités saturées par des gaz de fission : i. des cavités intergranulaires plutôt lenticulaires, dont la taille varie de quelques dizaines à plusieurs centaines de nanomètres, ii. des cavités intragranulaires plutôt sphériques, dont la taille est de l'ordre du nanomètre. Des travaux récents ont montré qu'il existe un effet de surface à l'échelle des cavités nanométriques qui modifie le comportement élastique effectif du combustible. Ce travail vise à proposer un modèle micromécanique analytique capable de tenir compte de cette microstructure hétérogène ainsi que de l'effet de surface afin de décrire le comportement élastique macroscopique de l'UO2 irradié. La démarche mise en oeuvre est fondée sur une modélisation multi-échelles et s'appuie sur des techniques d'homogénéisation en mécanique des matériaux. L'UO2 irradié est décrit comme un matériau poreux contenant des nanocavités sphériques (cavités intragranulaires) et sphéroïdales (cavités intergranulaires), sous pression et orientées aléatoirement. L'effet de surface présent à l'échelle nanométrique est pris en compte via un modèle d'interface imparfaite cohérente entre la matrice et les cavités. Un modèle original fondé sur l'approche par motifs morphologiques représentatifs a été développé afin de décrire le comportement élastique effectif de ce milieu hétérogène. Le modèle analytique proposé repose sur des hypothèses simplificatrices dont la pertinence est évaluée à partir de simulations numériques par éléments finis qui s'appuient sur une formulation spécifique afin de tenir compte de la présence d'interfaces imparfaites cohérentes
The irradiated uranium dioxide (UO2), which is the nuclear fuel of pressurized water reactors, contains two populations of cavities saturated by fission gaz: i. intergranular cavities almost lenticular in shape whose size ranges between few tens to several hundred nanometers, ii. intragranular cavities, almost spherical in shape whose size is of the order of the nanometer. Recent studies have shown the existence of a surface effect at the scale of nanometric cavities, which influences the effective elastic behavior of the nuclear fuel. In this work, an analytical micromechanical model, which is able to take into account this heterogeneous microstructure and the surface effect at the nanometric scale, is proposed to describe the macroscopic behavior of the irradiated UO2. The approach is based on a multiscale modeling and homogenization techniques in mechanics of materials. The irradiated UO2 is described as a porous media, which contains pressurized spherical nanocavities (intragranular cavities) and randomly oriented pressurized spheroidal cavities (intergranular cavities). The surface effect is taken into account with imperfect coherent interfaces between the matrix and the cavities. A novel model based on the morphologically representative pattern approach has been developed to describe the effective elastic behavior of this heterogeneous medium. The proposed model relies on assumptions whose relevance is evaluated with finite element simulations which require a specific formulation to take into account the imperfect coherent interfaces
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Rebufa, Jocelyn. "Vibrations de ligne d'arbre sur paliers hydrodynamiques : influence de l'état de surface." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC044/document.

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Le palier hydrodynamique est une solution de guidage en rotation particulièrement appréciée pour ses caractéristiques d’amortissement à hautes vitesses de rotation. Cependant les performances des machines tournantes lubrifiées par un film fluide sont impactées par des effets non linéaires difficiles à analyser. La prédiction du comportement du système par la simulation nécessite une modélisation avancée de l’écoulement de lubrifiant dans le palier hydrodynamique. Enfin, l’état de surface semble avoir un impact important sur l’écoulement du fluide lubrifiant, lui-même agissant sur les caractéristiques statiques et dynamiques des parties tournantes. Cette étude vise à améliorer les modèles numériques liés à l’impact de l’état de surface des paliers hydrodynamiques sur la dynamique de ligne d’arbre. La méthode d’homogénéisation multi-échelles a été utilisée à cet effet dans un algorithme multi-physiques pour décrire l’interaction entre la structure flexible en rotation et les films fluides des supports de lubrification. Différents modèles ont été utilisés pour prendre en compte la présence de zone de rupture de film lubrifiant. Des méthodologies non-linéaires fréquentielles ont été mises en place afin de permettre l’étude paramétrique des solutions périodiques d’un tel système et de leur stabilité. Afin de confronter ce modèle complexe à la réalité, un banc d’essai miniature a également été conçu. Différents échantillons présentant des états de surface modifiés par ablation à l’aide de LASER femto-seconde ont été testés. L’étude expérimentale a permis de vérifier certaines tendances prévues par la simulation. Des améliorations des performances des paliers hydrodynamiques par rapport aux vibrations auto-entretenues du système ont été démontrées pour certaines textures. En revanche toutes les améliorations ne sont pas prédites par les algorithmes d’homogénéisation multi-échelles. La présence de recirculation dans les aspérités du motif a été mise en évidence à partir de la résolution locale des équations de Navier-Stokes. Ce résultat participe à la remise en question des hypothèses classiques utilisées en texturation, et peut justifier les améliorations obtenues expérimentalement avec les paliers texturés
The hydrodynamic bearing provides good damping properties in rotating machineries. However, the performances of rotor-bearings systems are highly impacted by nonlinear effects that are difficult to analyze. The rotordynamics prediction requires advanced models for the flow in the bearings. The surface of the bearings seems to have a strong impact on the lubricant flow, acting on the static and dynamic properties of the rotating parts. This study aims to enhance the simulation of the bearings’ surface state effect on the motion of the rotating shaft. The flexible shaft interacts with textured hydrodynamic bearings. Multi-scales homogenization is used in a multi-physics algorithm in order to describe the fluid-structure interaction. Different models are used to account for the cavitation phenomenon in the bearings. Nonlinear harmonic methods allow efficient parametric studies of periodic solutions as well as their stability. Moreover, a test rig has been designed to compare predictions to real measurements. Several textured shaft samples modified with femto-seconds LASER surface texturing are tested. In most cases the experimental study showed similar results than the simulation. Enhancements of the vibration behaviors of the rotor-bearing system have been revealed for certain texturing patterns. The self-excited vibration, also known as "oil whirl" phenomenon, is stabilized on a wide rotating frequency range. However, the simulation tool does not predict well the enhancements that are observed. Vortices in surface texturing patterns have been revealed numerically with Navier-Stokes equation resolution. These results are opposed to the classical lubrication hypothesis. It is also a possible explanation of the enhancements that are experimentally measured with textured bearings
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Melkumyan, Narek. "Surface-based Synthesis of 3D Maps for Outdoor Unstructured Environments." Australian Centre for Field Robotics, 2009. http://hdl.handle.net/2123/5125.

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Doctor of Philosophy(PhD)
This thesis is concerned with the theoretical and practical development of a surface-based mapping algorithm for reliable and robust localization and mapping in prior unknown and unstructured environments. A surface-based map consists of a set of compressed surfaces, processed and represented without geometrical modelling. Each surface in the surface-based map represents an object in the environment. The ability to represent the exact shapes of objects via individual surfaces during the mapping process makes the surface-based mapping algorithm valuable in a number of navigation applications, such as mapping of prior unknown indoor and outdoor unstructured environments, target tracking, path planning and collision avoidance. The ability to unify representations of the same object taken from different viewpoints into a single surface makes the algorithm capable of working in multi-robot mapping applications. A surface-based map of the environment is build incrementally by acquiring the 3D range image of the scene, extracting the objects' surfaces from the 3D range image, aligning the set of extracted surfaces relative to the map and unifying the aligned set of surfaces with surfaces in the map. In the surface unification process the surfaces representing the same object are unified to make a single surface. The thesis introduces the following new methods which are used in the surface-based mapping algorithm: the extraction of surfaces from 3D range images based on a scanned surface continuity check; homogenization of the representation of the non-homogenously sampled surfaces; the alignment of the surface set relative to a large set of surfaces based on surface-based alignment algorithm; evaluating the correspondence between two surfaces based on the overlap area between surfaces; unification of the two surfaces belonging to the same object; and surface unification for a large set of surfaces. The theoretical contributions of this thesis are demonstrated with a series of practical implementations in different outdoor environments.
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Book chapters on the topic "Surface homogenization"

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Cioranescu, Doina, Alain Damlamian, and Tatsien Li. "Periodic Homogenization for Inner Boundary Conditions with Equi-valued Surfaces: The Unfolding Approach." In Partial Differential Equations: Theory, Control and Approximation, 183–209. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41401-5_7.

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Panin, Sergey V., Lyudmila A. Kornienko, Nguyen Duc Anh, Vladislav O. Alexenko, Dmitry G. Buslovich, and Svetlana A. Bochkareva. "Three-Component Wear-Resistant PEEK-Based Composites Filled with PTFE and MoS2: Composition Optimization, Structure Homogenization, and Self-lubricating Effect." In Springer Tracts in Mechanical Engineering, 275–99. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_13.

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AbstractThe aim of this work was to design and optimize compositions of three-component composites based on polyetheretherketone (PEEK) with enhanced tribological and mechanical properties. Initially, two-component PEEK-based composites loaded with molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE) were investigated. It was shown that an increase in dry friction mode tribological characteristics in metal-polymer and ceramic-polymer tribological contacts was attained by loading with lubricant fluoroplastic particles. In addition, molybdenum disulfide homogenized permolecular structure and improved matrix strength properties. After that, a methodology for identifying composition of multicomponent PEEK-based composites having prescribed properties which based on a limited amount of experimental data was proposed and implemented. It was shown that wear rate of the “PEEK + 10% PTFE + 0.5% MoS2” composite decreased by 39 times when tested on the metal counterpart, and 15 times on the ceramic one compared with neat PEEK. However, in absolute terms, wear rate of the three-component composite on the metal counterpart was 1.5 times higher than on the ceramic one. A three-fold increase in wear resistance during friction on both the metal and ceramic counterparts was achieved for the “PEEK + 10% PTFE + 0.5% MoS2” three-component composite compared with the “PEEK + 10% PTFE”. Simultaneous loading with two types of fillers slightly deteriorated the polymer composite structure compared with neat PEEK. However, wear rate was many times reduced due to facilitation of transfer film formation. For this reason, there was no microabrasive wear on both metal and ceramic counterpart surfaces.
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Kozłowski, Z. "Selective conveying and homogenization in the Bełchatów mine." In Continuous Surface Mining, 67–72. CRC Press, 2020. http://dx.doi.org/10.1201/9781003079422-9.

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Kasagi, T., M. Kuramori, K. Suehiro, Y. Oishi, K. Ariga, and T. Kunitake. "Morphological homogenization of melamine lipid monolayer by using thermal molecular motion: formation of mesoscopic pattern based on hydrogen bonding network." In Studies in Surface Science and Catalysis, 537–40. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)82147-9.

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Yeom, Gil-Yong, Ghasem Eisaabadi Bozchaloei, Hyun-Kyu Lim, Shae Kwang Kim, Young-Ok Yoon, Soong-Keun Hyun, Nelson Netto, and Murat Tiryakioğlu. "Microstructural Evolution During Solution Treatment of ADC12 (A383) Alloy Die Castings." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000322.

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High-pressure die casting (HPDC) components are known to be not heat treatable due to the formation of unacceptable surface blisters, dimensional instability, and poor mechanical properties during conventional solution treatment, such as at 540°C for 8 h. In the present study, the possibility of solution treating a recycled ALDC12 HPDC alloy at temperatures less than 500°C and with shorter solution treatment times was investigated. HPDCs with thickness of 2 and 3 mm were solution treated at 490°C for various times ranging from 15 to 180 min. Microstructural evolution during solution treatment was examined by various techniques, including metallography, energy dispersive spectrometry, electrical conductivity, and X-ray diffraction. Results indicated that almost all of the Al2Cu intermetallics were dissolved within 90 min of solution treatment. The coarsening of eutectic Si particles was found to follow the Lifshitz–Slyozov–Wagner theory with two distinct regimes. Furthermore, measurements of Cu concentration within α-Al dendrites revealed that the diffusion of Cu atoms in α-Al phase is not the primary limiting factor for homogenization of the alloy. Most importantly, no blisters were observed at the surface of the castings. Therefore, this heat treatment can be used for HPDC components from ALDC12 alloy at a reasonable time.
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Wunderlich, Wilfried, Janos Lendvai, and Hans-Joachim Gudladt. "Microstructure Imaging, Precipitation Formation and Mechanical Properties: Al–Li and Al–Mg–Zn Alloys." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000219.

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This article describes concepts of three features of microstructure–properties relationship, first the imaging and formation of nano-particles, then their contribution to hardness, and finally hydrogen embrittlement during fatigue. First, we briefly review the imaging modes in transmission electron microscopy (TEM) for nano-sized precipitates. The next issue is the hardening in Aluminum alloys, which is caused by GP-zones or precipitates, formed at the second step of the annealing process. After homogenization, the peak-hardness can be generally achieved by a few hours of annealing between 120°C and 200°C. Hardness measurements and equal-channel axial pressing (ECAP) showed that even at room temperature the driving force for formation of the particles is so strong that already within one hour of annealing after homogenization a remarkable hardening occurs. The third issue, hydrogen embrittlement, is caused by oxidation of pure Al surfaces produced at the crack tip during fatigue under ambient or wet moisture conditions. The cracks propagate preferentially along the precipitation free zone adjacent to grain boundaries, where hydrogen diffusion is fastest.
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"Friction and Abrasion Multiscale rubber friction homogenization for rough surfaces." In Constitutive Models for Rubber IX, 115–22. CRC Press, 2015. http://dx.doi.org/10.1201/b18701-21.

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Conference papers on the topic "Surface homogenization"

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Manara, Veronica, Michele Brunetti, Maurizio Maugeri, Arturo Sanchez-Lorenzo, and Martin Wild. "Homogenization of a surface solar radiation dataset over Italy." In RADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS). Author(s), 2017. http://dx.doi.org/10.1063/1.4975544.

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Pintar, A. L., A. Possolo, and N. F. Zhang. "Regional homogenization of surface temperature records using robust statistical methods." In TEMPERATURE: ITS MEASUREMENT AND CONTROL IN SCIENCE AND INDUSTRY, VOLUME 8: Proceedings of the Ninth International Temperature Symposium. AIP, 2013. http://dx.doi.org/10.1063/1.4819689.

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Schobinger, Markus, Karl Hollaus, and Igor Tsukerman. "Homogenization of laminated magnetic cores and the role of surface charges." In 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2017. http://dx.doi.org/10.1109/iceaa.2017.8065419.

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Menne, M. J., C. N. Williams, and P. W. Thorne. "Benchmarking the performance of pairwise homogenization of surface temperatures in the United States." In TEMPERATURE: ITS MEASUREMENT AND CONTROL IN SCIENCE AND INDUSTRY, VOLUME 8: Proceedings of the Ninth International Temperature Symposium. AIP, 2013. http://dx.doi.org/10.1063/1.4821423.

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Li, Mancang, Kan Wang, and Dong Yao. "The Super Equivalence Method in Monte Carlo Based Homogenization." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30882.

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The general equivalence theory (GET) and the superhomogenization method (SPH) are widely used for equivalence in the standard two-step reactor physics calculation. GET has behaved well in light water reactor calculation via nodal reactor analysis methods. The SPH was brought up again lately to satisfy the need of accurate pin-by-pin core calculations. However, both of the classical methods have their limitations. The super equivalence method (SPE) is proposed in the paper as an attempt to preserve the surface current, the reaction rates and the reactivity. It enhances the good property of the SPH method through reaction rates based normalization. The concept of pin discontinuity factors are utilized to preserve the surface current, which is the basic idea in the GET technique. However, the pin discontinuity factors are merged into the homogenized cross sections and diffusion coefficients, thus no additional homogenization parameters are needed in the succedent reactor core calculation. The eigenvalue preservation is performed after the reaction rate and surface current have been preserved, resulting in reduced errors of reactivity. The SPE has been implemented into the Monte Carlo method based homogenization code MCMC, as part of RMC Program, under developed in Tsinghua University. The C5G7 benchmark problem have been carried out to test the SPE. The results show that the SPE method not only suits for the equivalence in Monte Carlo based homogenization but also provides improved accuracy compared to the traditional GET or SPH method.
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Marsan, Anne L., and Deba Dutta. "Construction of a CAD Model From 3D Homogenization Output." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0018.

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Abstract A homogenization method has been recently developed to optimize the topology of a structure. This method will suggest a structural topology, but the results will be in a discretized, finite element form. Most engineering applications, however, require smooth structures, whether the faces of the structures be planar or curved. Given the topology of a three-dimensional structure as suggested by the homogenization method, an algorithm is developed to interpret the structure and generate a smooth, manufacturable surface representation of the structure. Some steps of the algorithm require designer inputs. An example is given which demonstrates this algorithm.
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Yazdani, Miad, and Jamal Seyed-Yagoobi. "Thermal Homogenization in Spherical Reservoir by EHD Conduction Phenomenon." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56142.

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Electrohydrodynamic (EHD) conduction phenomenon involves the interaction of electric field and flow field in a dielectric fluid medium via the process of dissociation and recombination of free charges. This paper numerically studies the effect of electric conduction phenomenon on the mixing mechanism of two fluids with identical physical properties but separated due to the non-homogeneity of the temperature field. The fluid is designated to be restored in a spherical reservoir and it is not spontaneously mixed since the reservoir is predicted to be located in non-gravity environment. The electrodes are embedded on the reservoir surface such that the resultant electric body force causes the fluid with higher temperature mixes with the colder fluid and vice versa. The electric field and electric body force distribution and the resultant velocity field are presented. The results are illustrated in the form of time evolution of temperature distribution inside the reservoir. The effects of primary dimensionless numbers on the mixing time are studied.
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Kornievsky, A., and A. Nasedkin. "FINITE ELEMENT HOMOGENIZATION OF NANOPOROUS ELASTIC MATERIAL OF THE HEXAGONAL CLASS OF SYMMETRY WITH SURFACE EFFECTS." In INNOVATIVE TECHNOLOGIES IN SCIENCE AND EDUCATION. DGTU-PRINT, 2018. http://dx.doi.org/10.23947/itno.2018.1.290-295.

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Liu, Shun, Sun Jin, Xueping Zhang, Changhui Liu, Fuyong Yang, and Jiamin Chen. "Coupled Predicting Surface Variation by Face Milling of Engine Block/Head." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6327.

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Face milling commonly generates surface quality of roughness or variation, especially severe for the milling of large-scale components with complex surface geometry such as cylinder block, engine head, and valve body. Thus surface variation serves as an important indicator both for machining parameter selection and components’ service performance. Conversely the optimization of machining process is a vital objective to improve the surface quality and its service life of machined components. Many researchers have dedicated to the prediction of machined surface variation generated by face milling using numerical or experimental methods. However, the numerical methods based on finite element analysis (FEA) are good at predicting local deformation of workpiece under instantaneous milling force, particularly applied for online compensation in face milling. Whereas experimental methods can only be used to estimate whole surface variation through reverse correlation analysis of measured data and processing variables. Therefore, an efficient and comprehensive numerical model is highly desired for the prediction of surface variation of entire surface. This study proposes a coupled numerical simulation method, updating FE model literarily based on the integration of data from ABAQUS and MATLAB, to predict surface variation induced by the face milling of large-scale components with complex surfaces. Using the coupled model, the 3D variation of large-scale surface can be successfully simulated by considering face milling process including dynamic milling force, spiral curve of milling trajectory, and intermittently rotating contact characteristics. Surface variation is finally represented with point cloud from totally iterative FE analysis and verified by face milling experiment. Result shows that the new prediction method can simulate surface variation of complex components. Based on the verified model, a set of numerical analyses are conducted to evaluate the effects of local stiffness non-homogenization and milling force variation on machined surface variation. It demonstrates that surface variation with surface peaks and concaves is strongly correlated with local stiffness non-homogenization especially in feed direction. Thus the coupled prediction method provides a theoretical and efficient way to study surface variation induced by face milling of large-scale complex components.
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Bilgen, Onur, Erick I. Saavedra Flores, and Michael I. Friswell. "Optimization of Surface-Actuated Piezocomposite Variable-Camber Morphing Wings." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4971.

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A theoretical, two-dimensional, static-aeroelastic design, modeling and optimization of a variable-camber morphing airfoil that employs surface-induced forces via smart material actuators is presented. The structural parameters of the airfoil, mainly the substrate features, are determined using a Genetic Algorithm optimization technique. A coupled treatment of the fluid-structure interaction is employed which allows the realization of a design that is not only feasible in a bench top experiment, but that can also sustain aerodynamic loads in the wind tunnel. The substrate is assumed to be a carbon nanotube reinforced composite whose constitutive response is obtained by means of a homogenization-based multi-scale finite element model. A separate parametric study on different geometric configurations of representative volume elements is carried out for the description of the substrate material. The analyzed representative volume elements consist of a single wall carbon nanotube embedded in a soft polymer matrix.
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