Relevant bibliographies by topics / Dynamic heterogeneities

Academic literature on the topic 'Dynamic heterogeneities'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Dynamic heterogeneities"

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Stanley, H. Eugene, Sergey V. Buldyrev, Giancarlo Franzese, Nicolas Giovambattista, and Francis W. Starr. "Static and dynamic heterogeneities in water." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, no. 1827 (December 22, 2004): 509–23. http://dx.doi.org/10.1098/rsta.2004.1505.

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The thermodynamic behaviour of water seems to be related to static heterogeneities. These static heterogeneities are related to the local structure of water molecules and, when properly characterized, may offer an economical explanation of thermodynamic data. ‘What matters’ most in determining some of the unusual properties of liquid water may be the fact that the local geometry of the liquid molecules is not spherical or oblong, but rather tetrahedral. In respect to static heterogeneities, this local geometry is critical. The dynamic behaviour of water seems to be related to dynamic heterogeneities, which seem to explain the dynamics of supercooled liquid water well.
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Shaw, Bruce E. "Dynamic heterogeneities versus fixed heterogeneities in earthquake models." Geophysical Journal International 156, no. 2 (February 2004): 275–86. http://dx.doi.org/10.1111/j.1365-246x.2003.02134.x.

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Giovambattista, Nicolas, Marco G. Mazza, Sergey V. Buldyrev, Francis W. Starr, and H. Eugene Stanley. "Dynamic Heterogeneities in Supercooled Water†." Journal of Physical Chemistry B 108, no. 21 (May 2004): 6655–62. http://dx.doi.org/10.1021/jp037925w.

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Syutkin, V. M., S. Yu Grebenkin, and B. V. Bol’shakov. "Dynamic heterogeneities in glassy polymers." Polymer Science Series A 53, no. 10 (October 2011): 968–76. http://dx.doi.org/10.1134/s0965545x11090136.

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Bock, D., N. Petzold, R. Kahlau, S. Gradmann, B. Schmidtke, N. Benoit, and E. A. Rössler. "Dynamic heterogeneities in glass-forming systems." Journal of Non-Crystalline Solids 407 (January 2015): 88–97. http://dx.doi.org/10.1016/j.jnoncrysol.2014.09.029.

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Reddy, Th Dhileep N., and Bhabani S. Mallik. "Heterogeneity in the microstructure and dynamics of tetraalkylammonium hydroxide ionic liquids: insight from classical molecular dynamics simulations and Voronoi tessellation analysis." Physical Chemistry Chemical Physics 22, no. 6 (2020): 3466–80. http://dx.doi.org/10.1039/c9cp06796e.

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Microscopic structural and dynamic heterogeneities were investigated for three ionic liquids (ILs), tetraethylammonium hydroxide, tetrapropylammonium hydroxide, and tetrabutylammonium hydroxide employing classical molecular dynamics (MD) simulations.
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Doliwa, Burkhard, and Andreas Heuer. "How do dynamic heterogeneities evolve in time?" Journal of Non-Crystalline Solids 307-310 (September 2002): 32–39. http://dx.doi.org/10.1016/s0022-3093(02)01437-0.

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La Nave, Emilia, and Francesco Sciortino. "On Static and Dynamic Heterogeneities in Water†." Journal of Physical Chemistry B 108, no. 51 (December 2004): 19663–69. http://dx.doi.org/10.1021/jp047374p.

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Greff-Lefftz, Marianne, Laurent Métivier, and Jean Besse. "Dynamic mantle density heterogeneities and global geodetic observables." Geophysical Journal International 180, no. 3 (March 2010): 1080–94. http://dx.doi.org/10.1111/j.1365-246x.2009.04490.x.

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Kumar, Sanat K., Ralph H. Colby, Spiros H. Anastasiadis, and George Fytas. "Concentration fluctuation induced dynamic heterogeneities in polymer blends." Journal of Chemical Physics 105, no. 9 (September 1996): 3777–88. http://dx.doi.org/10.1063/1.472198.

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Dissertations / Theses on the topic "Dynamic heterogeneities"

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Täuber, Daniela, Jörg Schuster, Mario Heidernätsch, Michael Bauer, Günter Radons, and Borczyskowski Christian von. "Discrimination between static and dynamic heterogeneities in single dye diffusion in ultrathin liquid films." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-190911.

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Täuber, Daniela, Jörg Schuster, Mario Heidernätsch, Michael Bauer, Günter Radons, and Borczyskowski Christian von. "Discrimination between static and dynamic heterogeneities in single dye diffusion in ultrathin liquid films." Diffusion fundamentals 11 (2009) 76, S. 1-2, 2009. https://ul.qucosa.de/id/qucosa%3A14041.

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Widmer-Cooper, Asaph. "Structure and dynamics in two-dimensional glass-forming alloys." Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1320.

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The glass-transition traverses continuously from liquid to solid behaviour, yet the role of structure in this large and gradual dynamic transition is poorly understood. This thesis presents a theoretical study of the relationship between structure and dynamics in two-dimensional glass-forming alloys, and provides new tools and real-space insight into the relationship at a microscopic level. The work is divided into two parts. Part I is concerned with the role of structure in the appearance of spatially heterogeneous dynamics in a supercooled glass-forming liquid. The isoconfigurational ensemble method is introduced as a general tool for analysing the effect that a configuration has on the subsequent particle motion, and the dynamic propensity is presented as the aspect of structural relaxation that can be directly related to microscopic variations in the structure. As the temperature is reduced, the spatial distribution of dynamic propensity becomes increasingly heterogeneous. This provides the first direct evidence that the development of spatially heterogeneous dynamics in a fragile glass-former is related to spatial variations in the structure. The individual particle motion also changes from Gaussian to non- Gaussian as the temperature is reduced, i.e. the configuration expresses its character more and more intermittently. The ability of several common measures of structure and a measure of structural ‘looseness’ to predict the spatial distribution of dynamic propensity are then tested. While the local coordination environment, local potential energy, and local free volume show some correlation with propensity, they are unable to predict its spatial variation. Simple coarse-graining does not help either. These results cast doubt on the microscopic basis of theories of the glass transition that are based purely on concepts of free volume or local potential energy. In sharp contrast, a dynamic measure of structural ‘looseness’ - an isoconfigurational single-particle Debye-Waller (DW) factor - is able to predict the spatial distribution of propensity in the supercooled liquid. This provides the first microscopic evidence for previous correlations found between short- and long-time dynamics in supercooled liquids. The spatial distribution of the DW factor changes rapidly in the supercooled liquid and suggests a picture of structural relaxation that is inconsistent with simple defect diffusion. Overall, the work presented in Part I provides a real-space description of the transition from structure-independent to structure-dependent dynamics, that is complementary to the configuration-space description provided by the energy landscape picture of the glass transition. In Part II, an investigation is presented into the effect of varying the interparticle potential on the phase behaviour of the binary soft-disc model. This represents a different approach to studying the role of structure in glass-formation, and suggests many interesting directions for future work. The structural and dynamic properties of six different systems are characterised, and some comparisons are made between them. A wide range of alloy-like structures are formed, including substitutionally ordered crystals, amorphous solids, and multiphase materials. Approximate phase diagrams show that glass-formation generally occurs between competing higher symmetry structures. This work identifies two new glass-forming systems with effective chemical ordering and substantially different short- and medium-range structure compared to the glassformer studied in Part I. These represent ideal candidates for extending the study presented in Part I. There also appears to be a close connection between quasicrystal and glass-formation in 2D via random-tiling like structures. This may help explain the experimental observation that quasicrystals sometimes vitrify on heating. The alignment of asymmetric unit cells is found to be the rate-limiting step in the crystal nucleation and growth of a substitutionally ordered crystal, and another system shows amorphous-crystal coexistence and appears highly stable to complete phase separation. The generality of these results and their implications for theoretical descriptions of the glass transition are also discussed.
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Widmer-Cooper, Asaph. "Structure and dynamics in two-dimensional glass-forming alloys." Science. School of Chemistry, 2006. http://hdl.handle.net/2123/1320.

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Doctor of Philosophy (PhD)
The glass-transition traverses continuously from liquid to solid behaviour, yet the role of structure in this large and gradual dynamic transition is poorly understood. This thesis presents a theoretical study of the relationship between structure and dynamics in two-dimensional glass-forming alloys, and provides new tools and real-space insight into the relationship at a microscopic level. The work is divided into two parts. Part I is concerned with the role of structure in the appearance of spatially heterogeneous dynamics in a supercooled glass-forming liquid. The isoconfigurational ensemble method is introduced as a general tool for analysing the effect that a configuration has on the subsequent particle motion, and the dynamic propensity is presented as the aspect of structural relaxation that can be directly related to microscopic variations in the structure. As the temperature is reduced, the spatial distribution of dynamic propensity becomes increasingly heterogeneous. This provides the first direct evidence that the development of spatially heterogeneous dynamics in a fragile glass-former is related to spatial variations in the structure. The individual particle motion also changes from Gaussian to non- Gaussian as the temperature is reduced, i.e. the configuration expresses its character more and more intermittently. The ability of several common measures of structure and a measure of structural ‘looseness’ to predict the spatial distribution of dynamic propensity are then tested. While the local coordination environment, local potential energy, and local free volume show some correlation with propensity, they are unable to predict its spatial variation. Simple coarse-graining does not help either. These results cast doubt on the microscopic basis of theories of the glass transition that are based purely on concepts of free volume or local potential energy. In sharp contrast, a dynamic measure of structural ‘looseness’ - an isoconfigurational single-particle Debye-Waller (DW) factor - is able to predict the spatial distribution of propensity in the supercooled liquid. This provides the first microscopic evidence for previous correlations found between short- and long-time dynamics in supercooled liquids. The spatial distribution of the DW factor changes rapidly in the supercooled liquid and suggests a picture of structural relaxation that is inconsistent with simple defect diffusion. Overall, the work presented in Part I provides a real-space description of the transition from structure-independent to structure-dependent dynamics, that is complementary to the configuration-space description provided by the energy landscape picture of the glass transition. In Part II, an investigation is presented into the effect of varying the interparticle potential on the phase behaviour of the binary soft-disc model. This represents a different approach to studying the role of structure in glass-formation, and suggests many interesting directions for future work. The structural and dynamic properties of six different systems are characterised, and some comparisons are made between them. A wide range of alloy-like structures are formed, including substitutionally ordered crystals, amorphous solids, and multiphase materials. Approximate phase diagrams show that glass-formation generally occurs between competing higher symmetry structures. This work identifies two new glass-forming systems with effective chemical ordering and substantially different short- and medium-range structure compared to the glassformer studied in Part I. These represent ideal candidates for extending the study presented in Part I. There also appears to be a close connection between quasicrystal and glass-formation in 2D via random-tiling like structures. This may help explain the experimental observation that quasicrystals sometimes vitrify on heating. The alignment of asymmetric unit cells is found to be the rate-limiting step in the crystal nucleation and growth of a substitutionally ordered crystal, and another system shows amorphous-crystal coexistence and appears highly stable to complete phase separation. The generality of these results and their implications for theoretical descriptions of the glass transition are also discussed.
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Reinsberg, Stefan A. "Length scales of dynamic heterogeneities of low and high molecular weight glass formers from multidimensional NMR." [S.l.] : [s.n.], 2001. http://ArchiMeD.uni-mainz.de/pub/2002/0028/diss.pdf.

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Bauer, Michael, Mario Heidernätsch, Daniela Täuber, Jörg Schuster, Christian von Borczyskowski, and Günter Radons. "Investigations of static and dynamic heterogeneities in ultra-thin liquid films via scaled squared displacements of single molecule diffusion." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-190567.

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Bauer, Michael, Mario Heidernätsch, Daniela Täuber, Jörg Schuster, Christian von Borczyskowski, and Günter Radons. "Investigations of static and dynamic heterogeneities in ultra-thin liquid films via scaled squared displacements of single molecule diffusion." Diffusion fundamentals 11 (2009) 70, S. 1-2, 2009. https://ul.qucosa.de/id/qucosa%3A12984.

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Kerasidou, Ariadni. "Investigation of the nonlinear optical response of novel azobenzene-iminopyridine derivatives and the dynamic heterogeneities of water / methanol mixtures." Thesis, Angers, 2015. http://www.theses.fr/2015ANGE0065.

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Cette étude est divisée en deux parties: l'analyse des propriétés optiques non linéaires (NLO) de nouveaux dérivés pi-conjugués d’Azobenzène Iminopyridine et les hétérogénéités dynamiques (DH) des mélanges eau/méthanol. La première partie a été réalisée en utilisant la technique Z-scan ainsi que les techniques de génération de deuxième et troisième harmoniques (SHG/THG). Communément, l'optique non linéaire est le domaine de l'optique qui étudie l'interaction de la lumière avec un système matériel et les changements induits dans les propriétés optiques des matériaux parun champ électromagnétique intense. La non-linéarité réside dans le fait que la réponse du matériau ne dépend pas linéairement de l'intensité du champ électrique. Les matériaux qui possèdent une forte réponse non linéaire sont très utiles pour la photonique et l'optoélectronique. Ils peuvent être utilisés comme limiteurs optiques pour protéger les détecteurs de faisceaux laser de haute intensité, également comme commutateurs optiques, portes optiques logiques, etc., avec un objectif ultime qui est le traitement de signal optique et la fabrication d'ordinateurs optiques. La deuxième partie a été réalisée au moyen de calculs informatiques et plus particulièrement de simulations de dynamiques moléculaires dans l'eau, dans le méthanol et dans des mélanges eau/méthanol à différentes températures. La simulation par ordinateur est un outil très approprié pour explorer les liquides, également dans la plage de régime en surfusion, sans les limitations du processus de nucléation qui a lieu dans l'expérience réelle. Lorsque la température diminue les liquides surfondus subissent a minima une augmentation exponentielle de leur viscosité (Arrhenius). Cette grande modification des propriétés detransport apparaît bien que la structure ne change que légèrement avec la température
This study is divided into two parts: the investigation of the nonlinear optical (NLO) properties of new (pi)- conjugated Azobenzene Iminopyridine derivatives and the Dynamic Heterogeneities (DH) of water/methanol mixtures. The first part was achieved employing Z-scan, Second and Third Harmonic Generation (SHG/THG) techniques. Generally, nonlinear optics is the domain of optics that studies the interaction of light with a material system and the changes resulted in the optical properties of the materials by an intense electromagnetic field. The nonlinearity lies in the fact that the material response does not depend linearly on the intensity of the electric field. Materials with significant nonlinear response are very useful for photonics and optoelectronics. They can be used as optical limiters to protect sensitive detectors of high-intensity laser beams, as well as optical switches, optical logic gates and etc., with an ultimate objective the processing of optical signal and manufacture of optical computers. The second part was done via computer calculationsand more specifically Molecular Dynamic Simulations in water, methanol and water/methanol mixtures at different temperatures. Computer simulation is a very suitable tool for exploring liquids, also in the range of the supercooled regime, without the limitations of the nucleation process, which takes place in the real experiment. Supercooled liquids undergo an exponential (Arrhenius) or even larger increase of their viscosity, when the temperature decreases. This large modification of the transport properties appear while the structure only slightly changes with temperature
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Luo, Sheng-Nian Clayton Robert W. "I. The heterogeneities at the core-mantle and inner-core boundaries from PKP phases ; II. The static and dynamic behavior of silica at high pressures /." Diss., Pasadena, Calif. : California Institute of Technology, 2003. http://resolver.caltech.edu/CaltechETD:etd-05302003-174154.

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Tsamados, Michel. "Mechanical response of glassy materials : theory and simulation." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00466081.

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Il est bien établi que les propriétés mécaniques et rhéologiques d'une large classe de matériaux vitreux amorphes met en jeu - contrairement aux dislocations dans les cristaux - des rearrangements structuraux localisés formant par un processus de cascade des bandes de cisaillements. Cette localisation de la déformation est observée dans divers systèmes vitreux ainsi que dans des simulations numériques. Cette réponse mécanique complexe reste mal comprise à une échelle microscopique et il n'est pas clair si l'écoulement plastique peut être associé à une origine structurale locale ou à des processus purement dynamiques.Dans cette thèse nous envisageons ces problématiques à l'aide de simulations atomiques athermales sur un système Lennard-Jones modèle. Nous calculons le tenseur élastique moyenné localement sur une échelle nanométrique. A cette échelle, le verre est assimilable à un matériau composite comprenant un échafaudage rigide et des zones fragiles. L'étude détaillée de la déformation plastique à différents taux de cisaillement met en évidence divers régimes d'écoulement. En dessous d'un taux de cisaillement critique dépendant de la taille du système, la réponse mécanique atteind une limite quasistatique (effets de taille fini, cascades d'événements plastiques, contrainte seuil) alors que pour des taux de cisaillement plus importants les propriétés rhéologiques sont fixées par le taux de cisaillement imposé. Dans ce régime nous mettons en évidence la croissance d'une longueur de coopérativité dynamique et discutons de sa dépendance avec le taux de cisaillements.
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Books on the topic "Dynamic heterogeneities"

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Dynamical heterogeneities in glasses, colloids, and granular media. Oxford: Oxford University Press, 2011.

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Berthier, Ludovic, Giulio Biroli, Jean-Philippe Bouchaud, Luca Cipelletti, and Wim van Saarloos, eds. Dynamical Heterogeneities in Glasses, Colloids, and Granular Media. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199691470.001.0001.

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Biroli, Giulio, Luca Cipelletti, Jean-Philippe Bouchaud, and Ludovic Berthier. Dynamical Heterogeneities in Glasses, Colloids, and Granular Media. Oxford University Press, 2011.

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Biroli, Giulio, Luca Cipelletti, Jean-Philippe Bouchaud, Ludovic Berthier, and Wim van Saarloos. Dynamical Heterogeneities in Glasses, Colloids, and Granular Media. Oxford University Press, 2011.

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Dedehouanou, Sènakpon Fidèle A., and Didier Y. Alia. Dynamics of off-farm self-employment in West African Sahel. UNU-WIDER, 2020. http://dx.doi.org/10.35188/unu-wider/2020/899-3.

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This study uses detailed household-level data to analyse off-farm self-employment dynamics in Mali and Niger. It adds to the literature that acknowledges the existence of heterogeneities in informal work and the body of evidence on informal self-employment in fragile and conflict-affected countries. It finds that self-employed workers are more represented in the lower-tier informal work status, with a particularly high percentage in Niger and among female, rural, youth, and old adult workers in both countries. The study also finds that monthly average earnings from self-employment are lowest among lower-tier informal workers, who also have a low probability of transitioning out of this status. However, household-related factors such as asset and livestock holdings and non-labour income may play an important role in helping these vulnerable groups of workers move up the self-employment ladder, especially in the event of shocks.
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Book chapters on the topic "Dynamic heterogeneities"

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Bock, D., Th Körber, F. Mohamed, B. Pötzschner, and E. A. Rössler. "Dynamic Heterogeneities in Binary Glass-Forming Systems." In Advances in Dielectrics, 173–201. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72706-6_6.

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Maret, G., and M. Heckmeier. "Imaging of Dynamic Heterogeneities in Multiple Light Scattering." In Waves and Imaging through Complex Media, 349–67. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0975-1_20.

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Chamberlin, Ralph V. "Nanoscopic Heterogeneities in the Thermal and Dynamic Properties of Supercooled Liquids." In ACS Symposium Series, 228–48. Washington, DC: American Chemical Society, 2002. http://dx.doi.org/10.1021/bk-2002-0820.ch017.

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Tangi, Marco. "Dynamic Sediment Connectivity Modelling for Strategic River Basin Planning." In Special Topics in Information Technology, 27–37. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15374-7_3.

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AbstractSediment connectivity is a distributed property of river systems that emerges from the connected transfer of sediment between multiple sources and sinks. Its disruption, brought by anthropic disturbances, can have severe and unforeseen consequences on both fluvial ecosystems and human livelihood. Modeling network-scale sediment connectivity provides a foundational understanding of river processes and their response to new pressures and can be used to forecast future system evolutions. In this chapter, we present the basin-scale, dynamic sediment connectivity model D-CASCADE (Dynamic CAtchment Sediment Connectivity And DElivery), which quantifies spatiotemporal patterns of sediment delivery in river networks. D-CASCADE considers multiple factors affecting transport, including heterogeneities in hydrology and sediment supply, different grain sizes, channel morphological evolution, and reservoir presence and management. The model is designed to be flexible, data parsimonious, and computationally efficient. We also present two applications of D-CASCADE in real-world case studies for historic geomorphic evolution reconstruction and future dam impacts forecasting. D-CASCADE is intended for integrated, basin-scale water management efforts, to perform multiple screening of various decision portfolios for hydromorphological impact assessments.
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Sobolev, S. V., A. Yu Babeyko, U. Christensen, and M. Granet. "Temperature and Dynamics of the Upper Mantle Beneath the French Massif Central." In Upper Mantle Heterogeneities from Active and Passive Seismology, 269–75. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-015-8979-6_26.

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Du, Chaoliang, and Xianyue Su. "SH Surface Waves in a Half Space with Random Heterogeneities." In Computational Methods in Stochastic Dynamics, 255–66. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5134-7_15.

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Fuchs, K., L. P. Vinnik, and C. Prodehl. "Exploring heterogeneities of the continental mantle by high resolution seismic experiments." In Composition, Structure and Dynamics of the Lithosphere‐Asthenosphere System, 137–54. Washington, D. C.: American Geophysical Union, 1987. http://dx.doi.org/10.1029/gd016p0137.

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"Effect of Hollow Heterogeneities on Nitromethane Detonation." In Dynamic Aspects of Detonations, 462–70. Washington DC: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/5.9781600866265.0462.0470.

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Harrowell, Peter. "The length scales of dynamic heterogeneity: results from molecular dynamics simulations." In Dynamical Heterogeneities in Glasses, Colloids, and Granular Media, 229–63. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199691470.003.0007.

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Berthier, Ludovic, Giulio Biroli, Jean‐Philippe Bouchaud, and Robert L. Jack. "Overview of different characterizations of dynamic heterogeneity." In Dynamical Heterogeneities in Glasses, Colloids, and Granular Media, 68–109. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199691470.003.0003.

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Conference papers on the topic "Dynamic heterogeneities"

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Giovambattista, Nicolas. "Dynamic Heterogeneities in Liquid Water." In SLOW DYNAMICS IN COMPLEX SYSTEMS: 3rd International Symposium on Slow Dynamics in Complex Systems. AIP, 2004. http://dx.doi.org/10.1063/1.1764213.

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Bui, T. N., J. Gonsalez Dunia, and R. Labourdette. "Organizing Heterogeneities in Turbidites: a Key Factor in Dynamic Modelling." In Subsurface Challenges in West Africa - First EAGE West Africa Workshop 2013. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20131770.

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Sprega, G., F. Bigoni, R. Marino, and S. Banoori. "Karst Heterogeneities Captured Through Integration of Static & Dynamic Data." In Third EAGE Workshop on Iraq. Netherlands: EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201414356.

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Peillex, Guillaume, Laurent Baillet, and Yves Berthier. "Homogeneous Approach for Composite Under Dynamic Contact With Friction." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44438.

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An explicit dynamic 2D finite element model of a composite under dynamic tribological loading is proposed. The software used for this kind of application manages contact conditions thanks to the Lagrange multipliers. The kind of contact is a deformable against rigid surface one. First of all due to ill-posedness of the classical Coulomb friction law, a regularized Coulomb friction law that allows local and global convergence of the models even under the presence of contact instabilities is proposed. This friction law is experimentally motivated and is similar to the simplified “Prakash-Clifton” law. In a second time the dynamic tribological behavior of the composite is studied by the mean of different models where the heterogeneities of the material are explicitly introduced. Those heterogeneous models stand for a description of the microscopic scale of the composite. A comparison is made between the results given by these heterogeneous models and the results obtained by the analysis of a homogeneous model. The elastic properties of the homogeneous model are obtained through classical homogenization process which is suitable here because the scale separation, difference between the size of the heterogeneities and the wavelength of the loading, is sufficiently important. The homogeneous model represents the macroscopic scale of the composite. Equivalence between heterogeneous models and the homogeneous one is straightforward if the contrast of Young’s modulus between the heterogeneities and the matrix is sufficiently low and if the local contact dynamic is stable. This equivalence has been observed for different contact instabilities like slip-separated, and stick-slip-separated ones. When the equivalence between the models is not ensured, because of high contrast of elastic properties for example, an adaptation of the dynamic parameter of the friction law is necessary to retrieve this equivalence. Finally the determination of the stresses and their evolution along the time in the heterogeneities and in the matrix is performed thanks to the relocalization process. This process is mixing dynamic analysis of the homogeneous models and fast static calculations on heterogeneous model. This process has already been applied to structures submitted to static loading but to our knowledge this is the first attempt to use it for dynamic contact problems. So this work highlights a full multi-scale approach for composite under dynamic contact with friction loading.
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Brechet, E., R. Piquot, P. Biver, P. Henriquel, C. Sontot, M. Bez, H. Ben Hadj Ali, and J. Mersmann. "Seismic Constrained Lobe Object Modelling for a Better Representation of Dynamic Heterogeneities." In 79th EAGE Conference and Exhibition 2017. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201700735.

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Soboleva, O. N., B. G. Mikhilenko, and E. P. Kurochkina. "Evaluation of Effects of Small-scale Heterogeneities in Dynamic Modelling of Electromagnetic Logging." In KazGeo 2012. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20142947.

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Ivanov, G. V., B. I. Muzichenko, V. A. Pozdnyakov, and A. A. Tuzovsky. "Consideration of Velocity Heterogeneities Using Method of Dynamic Analogue of Time-depth Curve." In Saint Petersburg 2008. Netherlands: EAGE Publications BV, 2008. http://dx.doi.org/10.3997/2214-4609.20146951.

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Pinault, Hadrien, Etienne Balmes, Elodie Arlaud, and Régis Cottereau. "NUMERICAL ASSESSMENT OF THE INFLUENCE OF BALLAST HETEROGENEITIES ON THE DYNAMIC BEHAVIOR OF RAILWAY TRACKS." In XI International Conference on Structural Dynamics. Athens: EASD, 2020. http://dx.doi.org/10.47964/1120.9226.20126.

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Mishra, Partha P., and Hosam K. Fathy. "Can Photovoltaic Battery Energy Storage Systems Be Self-Balancing?" In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9754.

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This paper proposes a novel approach for integrating battery storage into photovoltaic (PV) arrays. The approach relies on the integration of PV arrays with individual batteries to form “hybrid cells” that are then assembled into series strings. We use Lyapunov analysis to show that the proposed hybrid strings are globally asymptotically self-balancing, meaning that initial variations in state of charge (SOC), no matter how large, converge to zero. The PV subsystem serves as a negative feedback path that guarantees self-balancing without requiring dedicated balancing circuits. This significantly reduces the cost of the power electronics needed for integrating batteries into PV farms, compared to typical integration topologies. The paper uses local linearization to approximate the balancing rate, thereby highlighting its independence of battery pack length and elucidating its dependence on subsystem sizing. Finally, a simulation study validates the paper’s theoretical insights regarding self-balancing, and examines its sensitivity to parameter heterogeneities.
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DiCarlo, David A. "Non-Monotonic Saturation and Pressure Profiles as a Testing Ground for Dynamic Multi-Phase Flow Models." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67753.

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There has been great recent interest in dynamic models of multi-phase flow. This is for two reasons: one, theoretical arguments suggest that the traditional multi-phase flow equations are not complete; two, various experimental measurements are unable to be described by the traditional models. In this talk, we discuss the observation that constant flux infiltrations into sands produce non-monotonic saturation and pressure profiles. We show how this non-monotonic behavior is the strongest evidence of dynamic effects in porous media, as other reported experimental evidence can be the result of varying measuring volumes, and/or media heterogeneities. Thus the extensive data set obtained for these non-monotonic provides the best testing ground for the various proposed dynamic extensions.
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Reports on the topic "Dynamic heterogeneities"

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Thompson, Aidan. Coarse-Grained Reactive Molecular Dynamics Simulations of Heterogeneities in Shocked Energetic Materials: LDRD Final Report. Office of Scientific and Technical Information (OSTI), November 2016. http://dx.doi.org/10.2172/1733244.

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Lieou, Charles Ka Cheong. Glassy dynamics in granular matter through flow heterogeneities: Shear-Transformation-Zone theory and applications in granular flow and nonlinear acoustics. Office of Scientific and Technical Information (OSTI), October 2018. http://dx.doi.org/10.2172/1477599.

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