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Journal articles on the topic 'Coalescence'

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Author: Grafiati

Published: 4 June 2021

Last updated: 22 June 2024

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1

Amador, Luis, Andrés Parada, Guillermo D’Elía, and Juan M. Guayasamin. "Uncovering hidden specific diversity of Andean glassfrogs of theCentrolene buckleyispecies complex (Anura: Centrolenidae)." PeerJ 6 (October 31, 2018): e5856. http://dx.doi.org/10.7717/peerj.5856.

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The glassfrogCentrolene buckleyihas been recognized as a species complex. Herein, using coalescence-based species delimitation methods, we evaluate the specific diversity within this taxon. Four coalescence approaches (generalized mixed Yule coalescents, Bayesian general mixed Yule-coalescent, Poisson tree processes, and Bayesian Poisson tree processes) were consistent with the delimitation results, identifying four lineages within what is currently recognized asC. buckleyi. We propose three new candidate species that should be tested with nuclear markers, morphological, and behavioral data. In the meantime, for conservation purposes, candidate species should be considered evolutionary significant units, in light of observed population crashes in theC. buckleyispecies complex. Finally, our results support the validity ofC. venezuelense, formerly considered as a subspecies ofC. buckleyi.

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2

Takahata, Naoyuki. "The coalescent in two partially isolated diffusion populations." Genetical Research 52, no. 3 (December 1988): 213–22. http://dx.doi.org/10.1017/s0016672300027683.

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SummaryThe n0 coalescent of Kingman (1982a, b) describes the family relationships among a sample of n0 individuals drawn from a panmictic species. It is a stochastic process resulting from n0 − 1 independent random events (coalescences) at each of which n (2 ≤ n ≤ n0) ancestral lineages of a sample are descended from n − 1 distinct ancestors for the first time. Here a similar genealogical process is studied for a species consisting of two populations with migration between them. The main interest is with the probability density of the time length between two successive coalescences and the spatial distribution of n − 1 ancestral lineages over two populations when n to n − 1 coalescence takes place. These are formulated based on a non-linear birth and death process with killing, and are used to derive several explicit formulae in selectively neutral population genetics models. To confirm and supplement the analytical results, a simulation method is proposed based on the underlying bivariate Markov chain. This method provides a general way for solving the present problem even when an analytical approach appears very difficult. It becomes clear that the effects of the present population structure are most conspicuous on 2 to 1 coalescence, with lesser extents on n to n − 1 (3 ≤ n) coalescence.This implies that in a more general model of population structure, the number of populations and the way in which a sample is drawn are important factors which determine the n0 coalescent.

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3

Mu, Zhao, Ruikang Tang, and Zhaoming Liu. "Construction of Inorganic Bulks through Coalescence of Particle Precursors." Nanomaterials 11, no. 1 (January 18, 2021): 241. http://dx.doi.org/10.3390/nano11010241.

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Bulk inorganic materials play important roles in human society, and their construction is commonly achieved by the coalescence of inorganic nano- or micro-sized particles. Understanding the coalescence process promotes the elimination of particle interfaces, leading to continuous bulk phases with improved functions. In this review, we mainly focus on the coalescence of ceramic and metal materials for bulk construction. The basic knowledge of coalescent mechanism on inorganic materials is briefly introduced. Then, the properties of the inorganic precursors, which determine the coalescent behaviors of inorganic phases, are discussed from the views of particle interface, size, crystallinity, and orientation. The relationships between fundamental discoveries and industrial applications are emphasized. Based upon the understandings, the applications of inorganic bulk materials produced by the coalescence of their particle precursors are further presented. In conclusion, the challenges of particle coalescence for bulk material construction are presented, and the connection between recent fundamental findings and industrial applications is highlighted, aiming to provide an insightful outlook for the future development of functional inorganic materials.

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4

Sampson, Koffi Y. "Structured coalescent with nonconservative migration." Journal of Applied Probability 43, no. 2 (June 2006): 351–62. http://dx.doi.org/10.1239/jap/1152413727.

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We study the ancestral process of a sample from a subdivided population with stochastically varying subpopulation sizes. The sizes of the subpopulations change very rapidly (almost every generation) with respect to the coalescent time scale. For haploid populations of size N, one coalescence time unit corresponds to N generations. Coalescence and migration events occur on the same time scale. We show that, when the total population size tends to infinity, the structured coalescent is obtained, thus confirming the robustness of the coalescent. Many population structure models have been shown to converge to the structured coalescent (see Herbots (1997), Hudson (1998), Nordborg (2001), Nordborg and Krone (2002), and Notohara (1990)).

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5

Sampson, Koffi Y. "Structured coalescent with nonconservative migration." Journal of Applied Probability 43, no. 02 (June 2006): 351–62. http://dx.doi.org/10.1017/s0021900200001686.

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We study the ancestral process of a sample from a subdivided population with stochastically varying subpopulation sizes. The sizes of the subpopulations change very rapidly (almost every generation) with respect to the coalescent time scale. For haploid populations of sizeN, one coalescence time unit corresponds toNgenerations. Coalescence and migration events occur on the same time scale. We show that, when the total population size tends to infinity, the structured coalescent is obtained, thus confirming the robustness of the coalescent. Many population structure models have been shown to converge to the structured coalescent (see Herbots (1997), Hudson (1998), Nordborg (2001), Nordborg and Krone (2002), and Notohara (1990)).

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6

Alanzi, Ayed A. R., and James H. Degnan. "Statistical inconsistency of the unrooted minimize deep coalescence criterion." PLOS ONE 16, no. 5 (May 10, 2021): e0251107. http://dx.doi.org/10.1371/journal.pone.0251107.

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Species trees, which describe the evolutionary relationships between species, are often inferred from gene trees, which describe the ancestral relationships between sequences sampled at different loci from the species of interest. A common approach to inferring species trees from gene trees is motivated by supposing that gene tree variation is due to incomplete lineage sorting, also known as deep coalescence. One of the earliest methods motivated by deep coalescence is to find the species tree that minimizes the number of deep coalescent events needed to explain discrepancies between the species tree and input gene trees. This minimize deep coalescence (MDC) criterion can be applied in both rooted and unrooted settings. where either rooted or unrooted gene trees can be used to infer a rooted species tree. Previous work has shown that MDC is statistically inconsistent in the rooted setting, meaning that under a probabilistic model for deep coalescence, the multispecies coalescent, for some species trees, increasing the number of input gene trees does not make the method more likely to return a correct species tree. Here, we obtain analogous results in the unrooted setting, showing conditions leading to inconsistency of the MDC criterion using the multispecies coalescent model with unrooted gene trees for four taxa and five taxa.

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7

Li, Guo Jian, Qiang Wang, Ying Jie Zhang, Yong Ze Cao, and Ji Cheng He. "Molecular Dynamics Simulation Study of the Structural Evolution in the Cu-Ni Coalescence Induced by Ni Heterocluster." Advanced Materials Research 299-300 (July 2011): 395–98. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.395.

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Molecular dynamics with an embedded atom method was used to study the coalescence of heteroclusters at different temperatures. The coalescences between heteroclusters and homoclusters were compared. The results showed that: the coalesced complex of two liquid heteroclusters separated into two small droplets at or above a certain temperature which was much higher than the melting temperature of each cluster. When the temperature was lower than the value, the ordered alignment on the close packed (111) facet was induced by Ni cluster. These phenomena did not occur during the homoclusters coalescence.

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8

Hancocks, Stephen. "Coalescence." British Dental Journal 219, no. 2 (July 2015): 47. http://dx.doi.org/10.1038/sj.bdj.2015.587.

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9

McSweeney, John K., and Boris G. Pittel. "Expected coalescence time for a nonuniform allocation process." Advances in Applied Probability 40, no. 4 (December 2008): 1002–32. http://dx.doi.org/10.1239/aap/1231340162.

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We study a process where balls are repeatedly thrown into n boxes independently according to some probability distribution p. We start with n balls, and at each step, all balls landing in the same box are fused into a single ball; the process terminates when there is only one ball left (coalescence). Let c := ∑jpj2, the collision probability of two fixed balls. We show that the expected coalescence time is asymptotically 2c−1, under two constraints on p that exclude a thin set of distributions p. One of the constraints is c = o(ln−2n). This ln−2n is shown to be a threshold value: for c = ω(ln−2n), there exists p with c(p) = c such that the expected coalescence time far exceeds c−1. Connections to coalescent processes in population biology and theoretical computer science are discussed.

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10

McSweeney, John K., and Boris G. Pittel. "Expected coalescence time for a nonuniform allocation process." Advances in Applied Probability 40, no. 04 (December 2008): 1002–32. http://dx.doi.org/10.1017/s0001867800002949.

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We study a process where balls are repeatedly thrown into n boxes independently according to some probability distribution p . We start with n balls, and at each step, all balls landing in the same box are fused into a single ball; the process terminates when there is only one ball left (coalescence). Let c := ∑ j p j 2, the collision probability of two fixed balls. We show that the expected coalescence time is asymptotically 2c −1, under two constraints on p that exclude a thin set of distributions p . One of the constraints is c = o(ln−2 n). This ln−2 n is shown to be a threshold value: for c = ω(ln−2 n), there exists p with c( p ) = c such that the expected coalescence time far exceeds c −1. Connections to coalescent processes in population biology and theoretical computer science are discussed.

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11

Moreno Soto, Álvaro, Tom Maddalena, Arjan Fraters, Devaraj van der Meer, and Detlef Lohse. "Coalescence of diffusively growing gas bubbles." Journal of Fluid Mechanics 846 (May 3, 2018): 143–65. http://dx.doi.org/10.1017/jfm.2018.277.

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Under slightly supersaturated conditions, bubbles need many minutes to grow due to the low gas diffusivity in liquids. When coalescence occurs, the fact that the bubbles have diffusively grown on top of a surface allows for control with precision of the location and the timing at which the coalescence takes place. Numerous coalescences of two $\text{CO}_{2}$ microbubbles in water are recorded at a frame rate of ${\sim}65\,000~\text{fps}$. The evolution of the coalescing process is analysed in detail, differentiating among three phases: neck formation, wave propagation along the bubble surface and bubble detachment. First of all, the formation of the collapsing neck between both bubbles is compared to a capillary–inertial theoretical model. Afterwards, the propagating deformation along the surface is characterised measuring its evolution, velocity and dominant wavelength. Once bubbles coalesce, the perturbing waves and the final shape of the new bubble breaks the equilibrium between buoyancy and capillary forces. Consequently, the coalesced bubble detaches and rises due to buoyancy, oscillating with its natural Minnaert frequency. In addition to the experiments, a boundary integral code has been used to obtain numerical results of the coalescence under similar conditions, showing excellent agreement with the experimental data.

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12

Becheler, Arnaud, and L. Lacey Knowles. "Occupancy spectrum distribution: application for coalescence simulation with generic mergers." Bioinformatics 36, no. 10 (February 12, 2020): 3279–80. http://dx.doi.org/10.1093/bioinformatics/btaa090.

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Abstract Motivation As the density of sampled population increases, especially as studies incorporate aspects of the spatial landscape to study evolutionary processes, efficient simulation of genetic data under the coalescent becomes a primary challenge. Beyond the computational demands, coalescence-based simulation strategies have to be reconsidered because traditional assumptions about the dynamics of coalescing lineages within local populations may be violated (e.g. more than two daughter lineages may coalesce to a parent at low population densities). Specifically, to efficiently assign n lineages to m parents, the order relation between n and m strongly affects the relevant algorithm for the coalescent simulator (e.g. only when n<2m, it is reasonable to assume that two lineages, at most, can be assigned to the same parent). Controlling the details of the simulation model as a function of n and m is then crucial to represent accurately and efficiently the assignment process, but current implementations make it difficult to switch between different types of lineage mergers at run-time or even compile-time. Results With the described occupancy spectrum and algorithm that generates the support of the joint probability distribution of the occupancy spectrum; computation is much faster than realizing the whole assignment process under the coalescent. Using general definitions of lineage merges, which also makes the codebase reusable, we implement several variants of coalescent mergers, including an approximation where low probability spectrums are discarded. Comparison of runtimes and performance of the different C++ highly reusable coalescence mergers (binary, multiple, hybrids) are given, and we illustrate their potential utility with example applications. Availability and implementation All components are integrated into Quetzal, an open-source C++ library for coalescence available at https://becheler.github.io/pages/quetzal.html. Supplementary information Supplementary data are available at Bioinformatics online.

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13

Barton, N. H., and A. M. Etheridge. "The Effect of Selection on Genealogies." Genetics 166, no. 2 (February 1, 2004): 1115–31. http://dx.doi.org/10.1093/genetics/166.2.1115.

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Abstract The coalescent process can describe the effects of selection at linked loci only if selection is so strong that genotype frequencies evolve deterministically. Here, we develop methods proposed by Kaplan, Darden, and Hudson to find the effects of weak selection. We show that the overall effect is given by an extension to Price’s equation: the change in properties such as moments of coalescence times is equal to the covariance between those properties and the fitness of the sample of genes. The distribution of coalescence times differs substantially between allelic classes, even in the absence of selection. However, the average coalescence time between randomly chosen genes is insensitive to the current allele frequency and is affected significantly by purifying selection only if deleterious mutations are common and selection is strong (i.e., the product of population size and selection coefficient, Ns > 3). Balancing selection increases mean coalescence times, but the effect becomes large only when mutation rates between allelic classes are low and when selection is extremely strong. Our analysis supports previous simulations that show that selection has surprisingly little effect on genealogies. Moreover, small fluctuations in allele frequency due to random drift can greatly reduce any such effects. This will make it difficult to detect the action of selection from neutral variation alone.

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14

Li, Mingpei. "Drop Coalescence." Massachusetts Review 60, no. 2 (2019): 240. http://dx.doi.org/10.1353/mar.2019.0038.

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15

Morse, Janice M. "Theoretical Coalescence." Nursing Research 67, no. 2 (2018): 177–87. http://dx.doi.org/10.1097/nnr.0000000000000263.

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16

Martula, D. Stefan, Roger T. Bonnecaze, and Douglas R. Lloyd. "The effects of viscosity on coalescence-induced coalescence." International Journal of Multiphase Flow 29, no. 8 (August 2003): 1265–82. http://dx.doi.org/10.1016/s0301-9322(03)00102-2.

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17

Gnedin, Alexander, Alexander Iksanov, and Alexander Marynych. "Λ-coalescents: a survey." Journal of Applied Probability 51, A (December 2014): 23–40. http://dx.doi.org/10.1239/jap/1417528464.

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Λ-coalescents model the evolution of a coalescing system in which any number of components randomly sampled from the whole may merge into larger blocks. This survey focuses on related combinatorial constructions and the large-sample behaviour of the functionals which characterize in some way the speed of coalescence.

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18

Gnedin, Alexander, Alexander Iksanov, and Alexander Marynych. "Λ-coalescents: a survey." Journal of Applied Probability 51, A (December 2014): 23–40. http://dx.doi.org/10.1017/s0021900200021161.

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Λ-coalescents model the evolution of a coalescing system in which any number of components randomly sampled from the whole may merge into larger blocks. This survey focuses on related combinatorial constructions and the large-sample behaviour of the functionals which characterize in some way the speed of coalescence.

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19

Zeng, Yongchao, Di Zeng, Tongxun Liu, Yongjian Cai, Yonghao Li, Mouming Zhao, and Qiangzhong Zhao. "Effects of Glucose and Corn Syrup on the Physical Characteristics and Whipping Properties of Vegetable-Fat Based Whipped Creams." Foods 11, no. 9 (April 20, 2022): 1195. http://dx.doi.org/10.3390/foods11091195.

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The aim of this work is to evaluate the effects of glucose and corn syrup on the physical characteristics and whipping properties of whipped creams. The interfacial protein concentration and apparent viscosity of emulsions increased with an increasing sugar concentration. In whipped creams, a shorter optimum whipping time (top), higher fat coalescence degree, higher firmness and higher stability were detected as sugar concentration increased. The partial coalescence degree, overrun and firmness of whipped cream with 30 wt% glucose reached 76.49%, 306% and 3.82 N, respectively, significantly (p < 0.05) higher than those (67.15%, 235% and 3.19 N) with 30 wt% corn syrup. Compared with glucose at the same sugar concentration, higher interfacial protein concentration and less-shaped aggregates and coalescences were observed for the emulsions upon the addition of corn syrup, which caused a lower degree of fat coalescence and a lower firmness of whipped cream. The differences could be explained by the presence of maltodextrin (MDX) in corn syrup, which protects absorbed protein throughout freezing and retards the formation of a continuous network during whipping. As a result, the addition of sugars could well improve stability of emulsion, firmness and foam stability of whipped cream efficiently. With a 25–30 wt% sugar addition, even if there was a lower partial coalescence degree and firmness compared with glucose, whipped cream with corn syrup exhibited relatively good stability. These results suggest that MDX improves the stability of emulsion and, thus, has a potential use in low-sugar whipped cream.

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20

Juza, Josef, and Ivan Fortelny. "Flow Induced Coalescence in Polymer Blends." Chemistry & Chemical Technology 7, no. 1 (March 10, 2013): 53–60. http://dx.doi.org/10.23939/chcht07.01.053.

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21

Sharaf, Khidir R., Nechirvan B. Ibrahim, and Sarwar Mohammed Rasheed. "Nullity of b-Bridge Coalescence Graphs." Journal of Zankoy Sulaimani - Part A 18, no. 1 (August 30, 2015): 167–78. http://dx.doi.org/10.17656/jzs.10461.

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22

Leister, Nico, and Heike Petra Karbstein. "Determination of the Dominating Coalescence Pathways in Double Emulsion Formulations by Use of Microfluidic Emulsions." Processes 11, no. 1 (January 11, 2023): 234. http://dx.doi.org/10.3390/pr11010234.

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In water-in-oil-in-water (W1/O/W2) double emulsions several irreversible instability phenomena lead to changes. Besides diffusive processes, coalescence of droplets is the main cause of structural changes. In double emulsions, inner droplets can coalesce with each other (W1–W1 coalescence), inner droplets can be released via coalescence (W1–W2 coalescence) and oil droplets can coalesce with each other (O–O coalescence). Which of the coalescence pathways contributes most to the failure of the double emulsion structure cannot be determined by common measurement techniques. With monodisperse double emulsions produced with microfluidic techniques, each coalescence path can be observed and quantified simultaneously. By comparing the occurrence of all possible coalescence events, different hydrophilic surfactants in combination with PGPR are evaluated and discussed with regard to their applicability in double emulsion formulations. When variating the hydrophilic surfactant, the stability against all three coalescence mechanisms changes. This shows that measuring only one of the coalescence mechanisms is not sufficient to describe the stability of a double emulsion. While some surfactants are able to stabilize against all three possible coalescence mechanisms, some display mainly one of the coalescence mechanisms or in some cases all three mechanisms are observed simultaneously.

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23

Yuan, Ao, Gengsheng Qin, Wenqing He, and Qizhai Li. "On Coalescence Analysis Using Genealogy Rooted Trees." Computational and Mathematical Methods in Medicine 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/194202.

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DNA sequence data are now being used to study the ancestral history of human population. The existing methods for such coalescence inference use recursion formula to compute the data probabilities. These methods are useful in practical applications, but computationally complicated. Here we first investigate the asymptotic behavior of such inference; results indicate that, broadly, the estimated coalescent time will be consistent to a finite limit. Then we study a relatively simple computation method for this analysis and illustrate how to use it.

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24

Notohara, Morihiro. "A perturbation method for the structured coalescent with strong migration." Journal of Applied Probability 37, no. 1 (March 2000): 148–67. http://dx.doi.org/10.1239/jap/1014842274.

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By applying a perturbation method to the structured coalescent process in population genetics theory, we obtain the approximate solutions of the moment generating functions for the total coalescence time, the number of segregating sites among sampled DNA sequences and the number of allele types in a sample in the case of strong migration.

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Notohara, Morihiro. "A perturbation method for the structured coalescent with strong migration." Journal of Applied Probability 37, no. 01 (March 2000): 148–67. http://dx.doi.org/10.1017/s002190020001531x.

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By applying a perturbation method to the structured coalescent process in population genetics theory, we obtain the approximate solutions of the moment generating functions for the total coalescence time, the number of segregating sites among sampled DNA sequences and the number of allele types in a sample in the case of strong migration.

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26

Wilkins, Jon F., and John Wakeley. "The Coalescent in a Continuous, Finite, Linear Population." Genetics 161, no. 2 (June 1, 2002): 873–88. http://dx.doi.org/10.1093/genetics/161.2.873.

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Abstract In this article we present a model for analyzing patterns of genetic diversity in a continuous, finite, linear habitat with restricted gene flow. The distribution of coalescent times and locations is derived for a pair of sequences sampled from arbitrary locations along the habitat. The results for mean time to coalescence are compared to simulated data. As expected, mean time to common ancestry increases with the distance separating the two sequences. Additionally, this mean time is greater near the center of the habitat than near the ends. In the distant past, lineages that have not undergone coalescence are more likely to have been at opposite ends of the population range, whereas coalescent events in the distant past are biased toward the center. All of these effects are more pronounced when gene flow is more limited. The pattern of pairwise nucleotide differences predicted by the model is compared to data collected from sardine populations. The sardine data are used to illustrate how demographic parameters can be estimated using the model.

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27

Nordborg, Magnus. "Structured Coalescent Processes on Different Time Scales." Genetics 146, no. 4 (August 1, 1997): 1501–14. http://dx.doi.org/10.1093/genetics/146.4.1501.

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It is demonstrated that the structured coalescent model can readily be extended to include phenomena such as partial selfing and background selection through the use of an approximation based on separation of time scales. A model that includes these phenomena, as well as geographic subdivision and linkage to a polymorphism maintained either by local adaptation or by balancing selection, is derived, and the expected coalescence time for a pair of genes is calculated. It is found that background selection reduces coalescence times within subpopulations and allelic classes, leading to a high degree of apparent differentiation. Extremely high levels of subpopulation differentiation are also expected for regions of the genome surrounding loci important in local adaptation. These regions will be wider the stronger the local selection, and the higher the selfing rate.

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28

Huang, Bingquan, Hong Liang, and Jiangrong Xu. "Lattice Boltzmann simulation of binary three-dimensional droplet coalescence in a confined shear flow." Physics of Fluids 34, no. 3 (March 2022): 032101. http://dx.doi.org/10.1063/5.0082263.

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Small-scale microscopic phenomena determine the behavior of large-scale droplets, which brings great challenges to accurately simulate the droplet coalescence process. In this paper, the mesoscopic lattice Boltzmann method based on the phase field theory is used to simulate the collision and coalescence of binary three-dimensional droplets in a confined shear flow. The numerical prediction of droplet coalescence behavior was first compared with the experimental result, and good agreement was reported. Then, we investigated the influences of a comprehensive range of capillary numbers ([Formula: see text]) and Reynolds numbers ([Formula: see text]) on the shearing dynamics of binary droplets and also provided a quantitative description of droplet behavior in terms of the droplet deformation parameter and relative trajectory. A shearing regime diagram is further constructed based on the coupling effect of Ca and Re, which reveals three distinct types of droplet behaviors, including coalescence, breakup after the coalescence, and non-coalescence. Concretely, three different patterns of droplets can be completely captured with the variation of Ca at low Re; only two types of coalescence and non-coalescence can be observed for a medium Re, and two droplets just slide over each other without the occurrence of the coalescence when Re is sufficiently large. Also, we identified two critical capillary numbers in the lower Re region and one critical capillary number in the middle Re region, respectively, characterizing flow type transitions from the coalescence to breakup, from the breakup to the non-coalescence, and from the coalescence to the non-coalescence. It is found that all the capillary numbers decrease with Re.

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29

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 (January 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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30

Notohara, Morihiro, and Takayoshi Umeda. "The coalescence time of sampled genes in the structured coalescent model." Theoretical Population Biology 70, no. 3 (November 2006): 289–99. http://dx.doi.org/10.1016/j.tpb.2006.05.005.

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31

Zhang, Lei, Zhong Min Wang, Hai Tao Ma, Wei Gang Wang, and Jun Jie Yang. "The Reorganization Coalescence Oil-Removing Device and the Effect of Treating Polymer Flooding Produced Liquid." Advanced Materials Research 726-731 (August 2013): 1994–98. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1994.

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In view of problem of the coalescence material jam and the demulsification lower by using the Coalescence oil-removing device which was using to treat high viscosity polymer flooding. The novel Coalescence oil-removing device was developed through the optimization of coalescence material and reasonable backwashing system designing, which can realize coalescence material regeneration and improve oil strains of coalescence effect. At the condition that polymer concentration was 426mg/L, pH=8.75, average oil was 365mg/L, suspended solid (SS) was 75mg/L; The oil of effluent can reach 50mg/L below, removal rate reached 86%; SS of the out water can reach 30mg / L, the removal rate reached 60%.

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32

Drew, Julian, Robert S. White, Frederik Tilmann, and Jon Tarasewicz. "Coalescence microseismic mapping." Geophysical Journal International 195, no. 3 (September 12, 2013): 1773–85. http://dx.doi.org/10.1093/gji/ggt331.

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33

Ispolatov, S., and P. L. Krapivsky. "Ballistic coalescence model." Physica A: Statistical Mechanics and its Applications 252, no. 1-2 (April 1998): 165–72. http://dx.doi.org/10.1016/s0378-4371(97)00656-0.

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34

Lobo, Lloyd, and Aileen Svereika. "Coalescence during emulsification." Journal of Colloid and Interface Science 261, no. 2 (May 2003): 498–507. http://dx.doi.org/10.1016/s0021-9797(03)00069-9.

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35

Kavehpour, H. Pirouz. "Coalescence of Drops." Annual Review of Fluid Mechanics 47, no. 1 (January 3, 2015): 245–68. http://dx.doi.org/10.1146/annurev-fluid-010814-014720.

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36

Greco, V., and C. M. Ko. "Hadronization via Coalescence." Acta Physica Hungarica A) Heavy Ion Physics 24, no. 1-4 (October 1, 2005): 235–40. http://dx.doi.org/10.1556/aph.24.2005.1-4.32.

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Stover, Richard L., Charles W. Tobias, and Morton M. Denn. "Bubble coalescence dynamics." AIChE Journal 43, no. 10 (October 1997): 2385–92. http://dx.doi.org/10.1002/aic.690431002.

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38

Lobo, Lloyd, Aileen Svereika, and Mridula Nair. "Coalescence during Emulsification." Journal of Colloid and Interface Science 253, no. 2 (September 2002): 409–18. http://dx.doi.org/10.1006/jcis.2002.8560.

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Lobo, Lloyd. "Coalescence during Emulsification." Journal of Colloid and Interface Science 254, no. 1 (October 2002): 165–74. http://dx.doi.org/10.1006/jcis.2002.8561.

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LOBO, L. "Coalescence during Emulsification3. Effect of Gelatin on Rupture and Coalescence." Journal of Colloid and Interface Science 254, no. 1 (October 1, 2002): 165–74. http://dx.doi.org/10.1016/s0021-9797(02)98561-9.

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Kumar, Sanjeev, G. Narsimhan, and D. Ramkrishna. "Coalescence in Creaming Emulsions. Existence of a Pure Coalescence Zone." Industrial & Engineering Chemistry Research 35, no. 9 (January 1996): 3155–62. http://dx.doi.org/10.1021/ie9600147.

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Chen, Shuai, Jiadao Wang, Chaolang Chen, and Awais Mahmood. "Understanding the coalescence and non-coalescence of underwater oil droplets." Chemical Physics 529 (January 2020): 110466. http://dx.doi.org/10.1016/j.chemphys.2019.110466.

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Martula, D. Stefan, Takuya Hasegawa, Douglas R. Lloyd, and Roger T. Bonnecaze. "Coalescence-Induced Coalescence of Inviscid Droplets in a Viscous Fluid." Journal of Colloid and Interface Science 232, no. 2 (December 2000): 241–53. http://dx.doi.org/10.1006/jcis.2000.7179.

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Lechón-Alonso, Pablo, Tom Clegg, Jacob Cook, Thomas P. Smith, and Samraat Pawar. "The role of competition versus cooperation in microbial community coalescence." PLOS Computational Biology 17, no. 11 (November 8, 2021): e1009584. http://dx.doi.org/10.1371/journal.pcbi.1009584.

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New microbial communities often arise through the mixing of two or more separately assembled parent communities, a phenomenon that has been termed “community coalescence”. Understanding how the interaction structures of complex parent communities determine the outcomes of coalescence events is an important challenge. While recent work has begun to elucidate the role of competition in coalescence, that of cooperation, a key interaction type commonly seen in microbial communities, is still largely unknown. Here, using a general consumer-resource model, we study the combined effects of competitive and cooperative interactions on the outcomes of coalescence events. To do so, we simulate coalescence events between pairs of communities with different degrees of competition for shared carbon resources and cooperation through cross-feeding on leaked metabolic by-products (facilitation). We also study how structural and functional properties of post-coalescence communities evolve when they are subjected to repeated coalescence events. We find that in coalescence events, the less competitive and more cooperative parent communities contribute a higher proportion of species to the new community because of their superior ability to deplete resources and resist invasions. Consequently, when a community is subjected to repeated coalescence events, it gradually evolves towards being less competitive and more cooperative, as well as more speciose, robust and efficient in resource use. Encounters between microbial communities are becoming increasingly frequent as a result of anthropogenic environmental change, and there is great interest in how the coalescence of microbial communities affects environmental and human health. Our study provides new insights into the mechanisms behind microbial community coalescence, and a framework to predict outcomes based on the interaction structures of parent communities.

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Peng, Ye, Tao Liu, Haifeng Gong, and Xianming Zhang. "Review of the Dynamics of Coalescence and Demulsification by High-Voltage Pulsed Electric Fields." International Journal of Chemical Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/2492453.

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The coalescence of droplets in oil can be implemented rapidly by high-voltage pulse electric field, which is an effective demulsification dehydration technological method. At present, it is widely believed that the main reason of pulse electric field promoting droplets coalescence is the dipole coalescence and oscillation coalescence in pulse electric field, and the optimal coalescence pulse electric field parameters exist. Around the above content, the dynamics of high-voltage pulse electric field promoting the coalescence of emulsified droplets is studied by researchers domestically and abroad. By review, the progress of high-voltage pulse electric field demulsification technology can get a better understanding, which has an effect of throwing a sprat to catch a whale on promoting the industrial application.

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Roy, Subhankar, Vikky Anand, and Rochish M. Thaokar. "Breakup and non-coalescence mechanism of aqueous droplets suspended in castor oil under electric field." Journal of Fluid Mechanics 878 (September 19, 2019): 820–33. http://dx.doi.org/10.1017/jfm.2019.665.

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The effect of an electric field on the coalescence of two water droplets suspended in an insulating oil (castor oil) in the non-coalescence regime is investigated. Unlike the immediate breakup of the bridge, as reported in earlier studies, e.g. Ristenpart et al. (Nature, vol. 461 (7262), 2009, pp. 377–380), the non-coalescence observed in our experiments indicate that at strong fields the droplets exhibit a tendency to coalesce, the intervening bridge thickens whereafter the bridge dramatically begins to thin, initiating non-coalescence. Numerical simulations using the boundary integral method are able to explain the physical mechanism of thickening of this bridge followed by thinning and non-coalescence. The underlying reason is the competing meridional and azimuthal curvatures which affect the pressure inside the bridge to become either positive or negative under the effect of electric field induced Maxwell stresses. Velocity and pressure profiles confirm this hypothesis and we are able to predict this behaviour of transitory coalescence followed by non-coalescence.

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Gat, A. D., and M. Gharib. "Elasto-capillary coalescence of multiple parallel sheets." Journal of Fluid Mechanics 723 (April 16, 2013): 692–705. http://dx.doi.org/10.1017/jfm.2013.86.

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AbstractWe analyse two-dimensional clamped parallel elastic sheets which are partially immersed in liquid as a model for elasto-capillary coalescence. In the existing literature this problem is studied via minimal energy analysis of capillary and elastic energies of the post-coalescence state, yielding the maximal stable post-coalescence bundle size. Utilizing modal stability analysis and asymptotic analysis, we studied the stability of the configuration before the coalescence occurred. Our analysis revealed previously unreported relations between viscous forces, body forces, and the instability yielding the coalescence, thus undermining a common assumption that coalescence will occur as long as it will not create a bundle larger than the maximal stable post-coalesced size. A mathematical description of the process creating the hierarchical coalescence structure was obtained and yielded that the mean number of sheets per coalesced region is limited to the subset ${2}^{N} $ where $N$ is the set of natural numbers. Our theoretical results were illustrated by experiments and good agreement with the theoretical predictions was observed.

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Zheng, Lifei, Dan Huang, Xiaoqing Li, and Xuan Hu. "Numerical Analysis of Fracture Behaviour on Marble Samples Containing Two Flaws." Advances in Civil Engineering 2020 (January 30, 2020): 1–15. http://dx.doi.org/10.1155/2020/6278289.

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Uniaxial compression tests were conducted on marble specimens containing two flaws. There are coplanar flaws and noncoplanar flaws. The inclination angle and spacing of flaws were considered of the coplanar flaws model, and the step angle and spacing of flaws were considered of the noncoplanar flaws model. Strength failure and crack coalescence behaviour were analysed in the paper. The crack evolution process containing microcrack initiation, coalescence, and failure is focused on the rock bridge coalescence and the extent of the pre-existing flaws. There are four forms of rock bridge coalescence: tensile crack coalescence, shear crack coalescence, mixed tensile and shear crack coalescence, and no coalescence. Also, there are four forms of the rock failure mode: tensile failure, shear failure, mixed tensile and shear failure, and split fracture. The outer end of the critical stress values were used to compare with the crack initiation strengths, and the crack initiation strengths were slightly larger than the critical stress. In addition, energy dissipation laws were analysed during the model fracturing process. The crack evolution mechanisms around the pre-existing flaw in the model were revealed by the distribution of microcrack and energy dissipation.

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Vishnyakov, V. I., S. A. Kiro, and A. A. Ennan. "Welding fumes formation. III. Growth and coalescence of the nuclei." Physics of Aerodisperse Systems, no. 50 (March 21, 2013): 97–107. http://dx.doi.org/10.18524/0367-1631.2013.50.160430.

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The processes of growth and coalescence of the nuclei formed in the dusty plasma of arc welding due to heterogeneous ion-induced nucleation is studied. There is a high flow rate of condensable atoms from the gas phase into the condensed phase resulting from coalescence of nuclei. This process leads to a decrease in the condensable vapor supersaturation and to the termination of nucleation and start of the bimodal coalescence. As a result, at the moment of phase transition, there is bimodal distribution of the primary particles: the small--size primary particles formed from drops with a low degree of association between the nuclei (intra--modal coalescence only), and the primary large--size particles formed from drops with a high degree of association of nuclei, resulting in their prolonged coalescence (intra--modal and intermodal coalescence).

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Mongodi, Silvia, Bélaïd Bouhemad, Anita Orlando, Andrea Stella, Guido Tavazzi, Gabriele Via, Giorgio Iotti, Antonio Braschi, and Francesco Mojoli. "Modified Lung Ultrasound Score for Assessing and Monitoring Pulmonary Aeration." Ultraschall in der Medizin - European Journal of Ultrasound 38, no. 05 (March 14, 2017): 530–37. http://dx.doi.org/10.1055/s-0042-120260.

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Abstract Purpose Lung Ultrasound Score (LUSS) is a useful tool for lung aeration assessment but presents two theoretical limitations. First, standard LUSS is based on longitudinal scan and detection of number/coalescence of B lines. In the longitudinal scan pleura visualization is limited by intercostal space width. Moreover, coalescence of B lines to define severe loss of aeration is not suitable for non-homogeneous lung pathologies where focal coalescence is possible. We therefore compared longitudinal vs. transversal scan and also cLUSS (standard coalescence-based LUSS) vs. qLUSS (quantitative LUSS based on % of involved pleura). Materials and methods 38 ICU patients were examined in 12 thoracic areas in longitudinal and transversal scan. B lines (number, coalescence), subpleural consolidations (SP), pleural length and pleural involvement (> or ≤ 50 %) were assessed. cLUSS and qLUSS were computed in longitudinal and transversal scan. Results Transversal scan visualized wider (3.9 [IQR 3.8 – 3.9] vs 2.0 [1.6 – 2.5] cm, p < 0.0001) and more constant (variance 0.02 vs 0.34 cm, p < 0.0001) pleural length, more B lines (70 vs 59 % of scans, p < 0.0001), coalescence (39 vs 28 %, p < 0.0001) and SP (22 vs 14 %, p < 0.0001) compared to longitudinal scan. Pleural involvement > 50 % was observed in 17 % and coalescence in 33 % of cases. Focal coalescence accounted for 52 % of cases of coalescence. qLUSS-transv generated a different distribution of aeration scores compared to cLUSS-long (p < 0.0001). Conclusion In unselected ICU patients, variability of pleural length in longitudinal scans is high and focal coalescence is frequent. Transversal scan and quantification of pleural involvement are simple measures to overcome these limitations of LUSS.

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