Relevant bibliographies by topics / Particules coalescentes

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  1. Journal articles

Academic literature on the topic 'Particules coalescentes'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Particules coalescentes"

1

Gnedin, Alexander, Alexander Iksanov та Alexander Marynych. "On Λ-Coalescents with Dust Component". Journal of Applied Probability 48, № 04 (2011): 1133–51. http://dx.doi.org/10.1017/s0021900200008664.

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We consider the Λ-coalescent processes with a positive frequency of singleton clusters. The class in focus covers, for instance, the beta(a,b)-coalescents witha> 1. We show that some large-sample properties of these processes can be derived by coupling the coalescent with an increasing Lévy process (subordinator), and by exploiting parallels with the theory of regenerative composition structures. In particular, we discuss the limit distributions of the absorption time and the number of collisions.
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2

Gnedin, Alexander, Alexander Iksanov та Alexander Marynych. "On Λ-Coalescents with Dust Component". Journal of Applied Probability 48, № 4 (2011): 1133–51. http://dx.doi.org/10.1239/jap/1324046023.

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We consider the Λ-coalescent processes with a positive frequency of singleton clusters. The class in focus covers, for instance, the beta(a, b)-coalescents with a > 1. We show that some large-sample properties of these processes can be derived by coupling the coalescent with an increasing Lévy process (subordinator), and by exploiting parallels with the theory of regenerative composition structures. In particular, we discuss the limit distributions of the absorption time and the number of collisions.
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3

Dhersin, Jean-Stéphane, and Linglong Yuan. "On the total length of external branches for beta-coalescents." Advances in Applied Probability 47, no. 03 (2015): 693–714. http://dx.doi.org/10.1017/s0001867800048795.

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In this paper we consider the beta(2 − α, α)-coalescents with 1 < α < 2 and study the moments of external branches, in particular, the total external branch lengthof an initial sample ofnindividuals. For this class of coalescents, it has been proved thatnα-1T(n)→DT, whereT(n)is the length of an external branch chosen at random andTis a known nonnegative random variable. For beta(2 − α, α)-coalescents with 1 < α < 2, we obtain limn→+∞n3α-5𝔼(Lext(n)−n2-α𝔼T)2= ((α − 1)Γ(α + 1))2Γ(4 − α) / ((3 − α)Γ(4 − 2α)).
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4

Dhersin, Jean-Stéphane, and Linglong Yuan. "On the total length of external branches for beta-coalescents." Advances in Applied Probability 47, no. 3 (2015): 693–714. http://dx.doi.org/10.1239/aap/1444308878.

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In this paper we consider the beta(2 − α, α)-coalescents with 1 < α < 2 and study the moments of external branches, in particular, the total external branch length of an initial sample of n individuals. For this class of coalescents, it has been proved that nα-1T(n) →DT, where T(n) is the length of an external branch chosen at random and T is a known nonnegative random variable. For beta(2 − α, α)-coalescents with 1 < α < 2, we obtain limn→+∞n3α-5 𝔼(Lext(n) − n2-α𝔼T)2 = ((α − 1)Γ(α + 1))2Γ(4 − α) / ((3 − α)Γ(4 − 2α)).
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5

Kamp, Johannes, Jörn Villwock, and Matthias Kraume. "Drop coalescence in technical liquid/liquid applications: a review on experimental techniques and modeling approaches." Reviews in Chemical Engineering 33, no. 1 (2017): 1–47. http://dx.doi.org/10.1515/revce-2015-0071.

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AbstractThe coalescence phenomenon of drops in liquid/liquid systems is reviewed with particular focus on its technical relevance and application. Due to the complexity of coalescence, a comprehensive survey of the coalescence process and the numerous influencing factors is given. Subsequently, available experimental techniques with different levels of detail are summarized and compared. These techniques can be divided in simple settling tests for qualitative coalescence behavior investigations and gravity settler design, single-drop coalescence studies at flat interfaces as well as between droplets, and detailed film drainage analysis. To model the coalescence rate in liquid/liquid systems on a technical scale, the generic population balance framework is introduced. Additionally, different coalescence modeling approaches are reviewed with ascending level of detail from empirical correlations to comprehensive film drainage models and detailed computational fluid and particle dynamics.
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6

Clark, J. M. C., and V. Katsouros. "Stably coalescent stochastic froths." Advances in Applied Probability 31, no. 01 (1999): 199–219. http://dx.doi.org/10.1017/s0001867800009022.

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A model of a stochastic froth is introduced in which the rate of random coalescence of a pair of bubbles depends on an inverse power law of their sizes. The main question of interest is whether froths with a large number of bubbles can grow in a stable fashion; that is, whether under some time-varying change of scale the distributions of rescaled bubble sizes become approximately stationary. It is shown by way of a law of large numbers for the froths that the question can be re-interpreted in terms of a measure flow solving a nonlinear Boltzmann equation that represents an idealized deterministic froth. Froths turn out to be stable in the sense that there are scalings in which the rescaled measure flow is tight and, for a particular case, stable in the stronger sense that the rescaled flow converges to an equilibrium measure. Precise estimates are also given for the degree of tightness of the rescaled measure flows.
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7

Clark, J. M. C., and V. Katsouros. "Stably coalescent stochastic froths." Advances in Applied Probability 31, no. 1 (1999): 199–219. http://dx.doi.org/10.1239/aap/1029954273.

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A model of a stochastic froth is introduced in which the rate of random coalescence of a pair of bubbles depends on an inverse power law of their sizes. The main question of interest is whether froths with a large number of bubbles can grow in a stable fashion; that is, whether under some time-varying change of scale the distributions of rescaled bubble sizes become approximately stationary. It is shown by way of a law of large numbers for the froths that the question can be re-interpreted in terms of a measure flow solving a nonlinear Boltzmann equation that represents an idealized deterministic froth. Froths turn out to be stable in the sense that there are scalings in which the rescaled measure flow is tight and, for a particular case, stable in the stronger sense that the rescaled flow converges to an equilibrium measure. Precise estimates are also given for the degree of tightness of the rescaled measure flows.
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8

Castledine, Meaghan, Pawel Sierocinski, Daniel Padfield, and Angus Buckling. "Community coalescence: an eco-evolutionary perspective." Philosophical Transactions of the Royal Society B: Biological Sciences 375, no. 1798 (2020): 20190252. http://dx.doi.org/10.1098/rstb.2019.0252.

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Community coalescence, the mixing of different communities, is widespread throughout microbial ecology. Coalescence can result in approximately equal contributions from the founding communities or dominance of one community over another. These different outcomes have ramifications for community structure and function in natural communities, and the use of microbial communities in biotechnology and medicine. However, we have little understanding of when a particular outcome might be expected. Here, we integrate existing theory and data to speculate on how a crucial characteristic of microbial communities—the type of species interaction that dominates the community—might affect the outcome of microbial community coalescence. Given the often comparable timescales of microbial ecology and microevolution, we explicitly consider ecological and evolutionary dynamics, and their interplay, in determining coalescence outcomes. This article is part of the theme issue ‘Conceptual challenges in microbial community ecology’.
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9

Dąbkowski, Dawid, Paweł Tabaszewski, and Paweł Górecki. "Minimizing the deep coalescence cost." Journal of Bioinformatics and Computational Biology 16, no. 05 (2018): 1840021. http://dx.doi.org/10.1142/s0219720018400218.

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Metagenomic studies identify the species present in an environmental sample usually by using procedures that match molecular sequences, e.g. genes, with the species taxonomy. Here, we first formulate the problem of gene-species matching in the parsimony framework using binary phylogenetic gene and species trees under the deep coalescence cost and the assumption that each gene is paired uniquely with one species. In particular, we solve the problem in the cases when one of the trees is a caterpillar. Next, we propose a dynamic programming algorithm, which solves the problem exactly, however, its time and space complexity is exponential. Next, we generalize the problem to include non-binary trees and show the solution for caterpillar trees. We then propose time and space-efficient heuristic algorithms for solving the gene-species matching problem for any input trees. Finally, we present the results of computational experiments on simulated and empirical datasets consisting of binary tree pairs.
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10

Reffas, S. A., M. Elmeguenni, and M. Benguediab. "Analysis of Void Growth and Coalescence in Porous Polymer Materials. Coalescence in Polymer Materials." Engineering, Technology & Applied Science Research 3, no. 3 (2013): 452–60. http://dx.doi.org/10.48084/etasr.330.

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The use of polymeric materials in engineering applications is growing more and more all over the world. This issue requests new methodologies of analysis in order to assess the material’s capability to withstand complex loads. The use of polyacetal in engineering applications has increased rapidly in the last decade. In order to evaluate the behavior, the damage and coalescence of this type of polymer, a numerical method based on damage which occurs following several stages (nucleation of cavities, their growth and coalescence in more advanced stages of deformation) is proposed in this work. A particular attention is given on the stress-strain and the volumetric strain evolution under different triaxiality and for three initial void shapes. Its application to polyacetal allows approving this approach for technical polymers. Finally, this method allow us to compare the obtained results of basic calculations at different triaxiality and to discuss their possible influence on the initial size and the geometrical shape of the porosity on the material failure.
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