Relevant bibliographies by topics / Stratified dispersal

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

Academic literature on the topic 'Stratified dispersal'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Stratified dispersal"

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LE CORRE, VALÉRIE, NATHALIE MACHON, RÉMY J. PETIT, and ANTOINE KREMER. "Colonization with long-distance seed dispersal and genetic structure of maternally inherited genes in forest trees: a simulation study." Genetical Research 69, no. 2 (1997): 117–25. http://dx.doi.org/10.1017/s0016672397002668.

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Since the last glacial period forest trees have expanded to their present range very rapidly, with rates up to 500 m yr−1 for oaks in Europe, which can be explained only by the dispersion of acorns over long distances. We used a stratified dispersal model, including both diffusive and long-distance dispersal of seeds, to simulate the colonization of a 100 km×300 km grid by populations of oak trees. An appropriate rate of spread is obtained with rare dispersal at distances of the order of tens of kilometres. We simulated the effect of stratified versus diffusive dispersal of seeds on the spatia
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Fobert, Emily K., Eric A. Treml, and Stephen E. Swearer. "Dispersal and population connectivity are phenotype dependent in a marine metapopulation." Proceedings of the Royal Society B: Biological Sciences 286, no. 1909 (2019): 20191104. http://dx.doi.org/10.1098/rspb.2019.1104.

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Larval dispersal is a key process determining population connectivity, metapopulation dynamics, and community structure in benthic marine ecosystems, yet the biophysical complexity of dispersal is not well understood. In this study, we investigate the interaction between disperser phenotype and hydrodynamics on larval dispersal pathways, using a temperate reef fish species, Trachinops caudimaculatus . We assessed the influence of larval traits on depth distribution and dispersal outcomes by: (i) using 24-h depth-stratified ichthyoplankton sampling, (ii) quantifying individual phenotypes using
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Clark, Geoffrey, Fiona Petchey, Olaf Winter, Mike Carson, and Patrick O'Day. "New Radiocarbon Dates from the Bapot-1 Site in Saipan and Neolithic Dispersal by Stratified Diffusion." Journal of Pacific Archaeology 1, no. 1 (2009): 21–35. http://dx.doi.org/10.70460/jpa.v1i1.7.

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The colonisation of the Mariana Islands in Western Micronesia is likely to represent an early ocean dispersal of more than 2000 km. Establishing the date of human arrival in the archipelago is important for modelling Neolithic expansion in Island Southeast Asia and the Pacific, particularly the role of long-distance dispersals. This paper presents new 14C results and a ΔR estimate from the Bapot-1 site on Saipan Island, which indicate human arrival at ca. 3400-3200 cal. BP. Archaeological chronologies of long-distance dispersal to Western Micronesia and the Lapita expansion (Bismarcks to Samoa
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Dessard, H., and A. Bar-Hen. "Experimental design for spatial sampling applied to the study of tropical forest regeneration." Canadian Journal of Forest Research 35, no. 5 (2005): 1149–55. http://dx.doi.org/10.1139/x04-187.

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For practical reasons, estimating seed production in tropical forest is only possible by sampling. Classical sampling designs (random or systematic) give poor estimations of seed abundance. The spatial disposition of the trees, combined with nonuniform seed dispersal, leads to a highly heterogeneous spatial distribution of the seeds. We propose a random stratified sampling design based on a model that takes account of seed dispersal processes and the location of the trees. We assume a gamma distribution for dispersal distances. The overall seed dispersal area is divided into adjacent quadrats.
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Sasaki, R., and SA Shepherd. "Larval dispersal and recruitment of Haliotis discus hannai and Tegula spp. on Miyagi coasts, Japan." Marine and Freshwater Research 46, no. 3 (1995): 519. http://dx.doi.org/10.1071/mf9950519.

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The spatial dispersal and vertical distribution of larvae of Haliotis discus hannai and Tegula spp. were examined in relation to storm events in Miyagi Prefecture, Japan, from 1983 to 1993. Epidemic spawning is induced by typhoons and minor storms. After typhoons, larvae are dispersed in coastal waters up to 3 km from shore to a depth of 30 m and later are advected toward the coast by onshore winds. After minor storms, larvae are locally dispersed close to shore. Larvae of H. discus hannai and Tegula spp. become vertically stratified and settle on the substratum at depths in accordance with th
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Strickland, Christopher, Nadiah P. Kristensen, and Laura Miller. "Inferring stratified parasitoid dispersal mechanisms and parameters from coarse data using mathematical and Bayesian methods." Journal of The Royal Society Interface 14, no. 130 (2017): 20170005. http://dx.doi.org/10.1098/rsif.2017.0005.

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Biological invasions have movement at the core of their success. However, due to difficulties in collecting data, medium- and long-distance dispersal of small insects has long been poorly understood and likely to be underestimated. The agricultural release of parasitic hymenoptera, a group of wasps that are critical for biological pest control, represents a rare opportunity to study the spread of insects on multiple spatial scales. As these insects are typically less than 1 mm in size and are challenging to track individually, a first-time biocontrol release will provide a known spatial positi
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Hill, A. E. "Diel vertical migration in stratified tidal flows: Implications for plankton dispersal." Journal of Marine Research 56, no. 5 (1998): 1069–96. http://dx.doi.org/10.1357/002224098765173464.

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Sapoukhina, Natalia, Yuri Tyutyunov, Ivan Sache, and Roger Arditi. "Spatially mixed crops to control the stratified dispersal of airborne fungal diseases." Ecological Modelling 221, no. 23 (2010): 2793–800. http://dx.doi.org/10.1016/j.ecolmodel.2010.08.020.

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Liebhold, Andrew M., Timothy H. Keitt, Nikunj Goel, and Cleo Bertelsmeier. "Scale invariance in the spatial-dynamics of biological invasions." NeoBiota 62 (October 15, 2020): 269–78. https://doi.org/10.3897/neobiota.62.53213.

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Despite the enormous negative consequences of biological invasions, we have a limited understanding of how spatial demography during invasions creates population patterns observed at different spatial scales. Early stages of invasions, arrival and establishment, are considered distinct from the later stage of spread, but the processes of population growth and dispersal underlie all invasion phases. Here, we argue that the spread of invading species, to a first approximation, exhibits scale invariant spatial-dynamic patterns that transcend multiple spatial scales. Dispersal from a source popula
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Mayorga-Adame, CG, JA Polton, AD Fox, and LA Henry. "Spatiotemporal scales of larval dispersal and connectivity among oil and gas structures in the North Sea." Marine Ecology Progress Series 685 (March 10, 2022): 49–67. http://dx.doi.org/10.3354/meps13970.

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The ecological role of offshore man-made infrastructure is of growing international interest. By 2030, globally more than 7500 oil and gas platforms could be removed, many of which now host mature hard substrate ecosystems formed by sessile benthic species including sponges, corals and mussels. We investigated the spatiotemporal scales of generalised species dispersal and connectivity among oil and gas structures in the North Sea using strategically designed 3D advective passive particle tracking experiments forced by high resolution (1.8 km, hourly) velocity fields including tide-, density- a
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Dissertations / Theses on the topic "Stratified dispersal"

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Mansoor, Wafaa Faisal. "Models of flow and diffusion: I : Selective withdrawal from a stratified fluid II: Dispersal of hydrogen in the retina." Thesis, Mansoor, Wafaa Faisal (2022) Models of flow and diffusion: I : Selective withdrawal from a stratified fluid II: Dispersal of hydrogen in the retina. PhD thesis, Murdoch University, 2022. https://researchrepository.murdoch.edu.au/id/eprint/65493/.

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This dissertation is divided into two parts. In the first part we investigate the withdrawal of fluid from a region of fluid with the outlet situated at an arbitrary location. A model for the dispersal of hydrogen released into the retina in an attempt to estimate blood flow in the eye is considered in the second part. In the first part, the flow induced by a line sink at an arbitrary location in a fluid of finite depth with a free surface, relevant to flows in reservoirs, lakes and cooling ponds, is examined. A rigid-lid solution for small flow rates is obtained and a numerical method based on funda
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Abrishami-Savjublagh, Yoseph. "Numerical computations of dispersed flow and gravity stratified two-phase flow." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47736.

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Mathews, Tobias John. "Void structure, colloid and tracer transport properties of stratified porous media." Thesis, University of Plymouth, 1999. http://hdl.handle.net/10026.1/2794.

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The characterisation of the properties of porous materials is of great importance in the effective management of natural and manmade systems. A sophisticated network model, 'Pore-Cor', of some of these properties has been previously developed. The present study has significantly extended the scope of the model's predictive capabilities. Flow and transport behaviour was examined in laboratory sand columns of various depths. These experiments examined unsaturated flow of water and conservative solute tracer transport through homogeneous sand samples. Flow through these was not homogeneous or rep
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Ávila, Ricardo Pereira de. "Estudo fenomenológico e numérico do escoamento estratificado óleo-água ondulado e com mistura na interface." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18147/tde-30052016-160240/.

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Escoamentos bifásicos estão presentes em diversos processos naturais e industriais, como na indústria de petróleo. Podem apresentar-se em diferentes configurações topológicas, ou, padrões de escoamento, entre eles o escoamento estratificado ondulado e o estratificado com mistura na interface. Os escoamentos bifásicos estratificados óleo-água têm sido utilizados como uma forma conveniente de evitar a formação de emulsões de água em óleo em oleodutos e possuem uma ocorrência comum em poços de petróleo direcionais. Quando a onda interfacial ultrapassa determinado limite geométrico e cinemático, s
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Book chapters on the topic "Stratified dispersal"

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Shigesada, Nanako, and Kohkichi Kawasaki. "Invasion by stratified diffusion." In Biological Invasions: Theory and Practice. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198548522.003.0005.

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Abstract So far, we have treated the movement of organisms as a diffusion process based on random walks. As we saw in Chapter 2, however, there are some species of birds, insects, plants and herding animals that expand their ranges not only by random movement into surrounding adjacent areas, but also by long-distance dispersal. When various modes of dispersal occur side by side within a species, Hengeveld (1989) proposed that such a dispersal process be called 'stratified diffusion' (but, in epidemiology, 'hierarchical diffusion' is in use as an alternative term).
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Omran, Sally Kamel Ali. "The Relationships between the Organizational, Environmental Characteristics and Marketing Performance." In Marketing and Consumer Behavior. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-7357-1.ch065.

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This research aimed at studying and analyzing the relationships between the organizational, environmental characteristics and marketing performance in three Egyptian private telecommunication companies. The analyzed data came from a hand delivery survey of a stratified random sample of 390 from the employees. Since the total numbers of the mobile customers are very large and geographically dispersed, an e-mail survey was used. The response rate for the employees was equal 92.3% and for the mobile customers 85.2%. The research ended up with the following main findings: (a) In general, there is
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Diwakar, Philip, Yuqing Liu, and Ismat ElJaouhari. "Evaluation of Flange Leakage due to Thermal Bowing and Shock." In Ageing and Life Extension of Offshore Facilities. ASME, 2022. http://dx.doi.org/10.1115/1.885789_ch21.

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During a flaring event, some operating conditions in an LNG plant cause liquid refrigerant to be introduced into a flare header causing large temperature gradients between the bottom and top wall and lead to vertical and lateral displacements along with rotation of the horizontal header. This thermal bowing is a serious problem with risk of flange leakage due to differential thermal expansion between bolts and flange and pipe cracks at high stress concentration location as it lifts off the supports. This paper evaluates the introduction of warm gas into the flare header to prevent a flange lea
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Conference papers on the topic "Stratified dispersal"

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Stegmann, D. W., and R. G. Asperger. "New Test for Oil Soluble/Water Dispersible Gas Pipeline Inhibitors." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87035.

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Abstract While the wheel test may be an acceptable initial screening test for inhibitor activity, it does not always follow that a good wheel test compound will perform well in the field. A test was developed that is better able to predict how an inhibitor will perform in a variety of field conditions. For an inhibitor to work in a gas pipeline, it must have good activity as an inhibitor and be able to reach the corroding surface. If in stagnant or stratified flow the inhibitor is in the condensate phase it may not get to corroding surface where it is needed. Since the wheel test provides good
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Li, Chong, Xuanping Tang, Francois Ayello, et al. "Experimental Study on Water Wetting and CO2 Corrosion in Oil-Water Two-Phase Flow." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06595.

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Abstract Internal corrosion occurs only when corrosive water wets the pipe inner wall. However, water wetting is one of most important missing links of our current overall understanding of internal corrosion of oil and gas pipelines. In this study, extensive experimental studies on water wetting in large diameter horizontal oil-water pipe flows were carried out. Four main techniques (wall conductance probes, Fe2+ concentration monitoring, wall sampling and flow pattern visualization) were used to determine phase wetting on the internal wall of pipe at different superficial oil and water veloci
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Deng, C., K. Adams, and T. MacFarlane. "Predicting the Curvature of the Interface for an Oil/Water Flow and Its Effects on Corrosion." In CORROSION 2008. NACE International, 2008. https://doi.org/10.5006/c2008-08564.

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Abstract Previous works on the oil/water flow corrosion have focused on the determination of the transition criteria from water-wetting to oil-wetting. In many situations, the criteria need to be properly applied along with the calculations of the two phase flow mass and momentum conservation. In this paper, a unified oil/water flow model was employed to simulate the transitions from stratified types of flow to dispersed types of flow. In addition, for stratified types of flows, the curvature of the interface is determined from the minimum of the total system energy. The predicted curved inter
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Ayello, François, Chong Li, Xuanping Tang, et al. "Determination of Phase Wetting in Oil–Water Pipe Flows." In CORROSION 2008. NACE International, 2008. https://doi.org/10.5006/c2008-08566.

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Abstract Oil-water two-phase flow often presents a internal corrosion problem in pipeline transportation. The corrosion rate of the mild steel line is closely related to which phase wets the pipe wall. The problem has been investigated here on a large scale, in a 60 meter-long flow loop with crude oils. In this paper extensive experimental studies of flow pattern as well as phase wetting determination have been carried out for different crude oils and different pipe inclinations. Four experimental techniques have been applied to determine which phase, water or oil, wets the pipe inner wall at
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Zhu, Zhenjin, Keith W. Sand, and Patrick J. Teevens. "Effects of Flow Regime on Solids Deposition in Multiphase Petroleum Flow." In CORROSION 2010. NACE International, 2010. https://doi.org/10.5006/c2010-10384.

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Abstract This paper has numerically researched the effects of flow regime on particle trajectories as well as solids deposition behaviours in multiphase petroleum flow. In this study, the flow patterns frequently encountered in oil and wet-gas petroleum pipelines were targeted, including annular mist flow, stratified smooth/wavy flow, slug flow, and elongated/dispersed bubble flow. Distributions of the liquid-phase velocity in gas-liquid two-phase flow were determined by means of theoretical derivation, numerical simulation, or using commercial software. Based on the acquired liquid-phase velo
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Kee, Kok Eng, Marijan Babic, Sonja Richter, Luciano Paolinelli, Wei Li, and Srdjan Nesic. "Flow Patterns and Water Wetting in Gas-Oil-Water Three-phase Flow - A Flow Loop Study." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-06113.

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Abstract In the oil and gas industry, multiphase flow environments are frequently encountered during the production and transportation of hydrocarbon products via pipelines. Most oil production wells naturally contain some fraction of water and gases. These fluids often flow concurrently in the pipelines, leading to a variety of complex flow patterns. However, the presence of acid gases such as CO2 and H2S soluble in the water can lead to internal corrosion attack if the water comes into contact with the mild steel pipe wall, a scenario known as ‘water wetting'. In this experimental work, a la
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Benzemel, Hafid, Jean-Michel Rosant, and Jack Legrand. "Liquid-Liquid and Gas-Liquid Flow Patterns in a Torus Reactor." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0764.

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Abstract Two-phase liquid/liquid and gas/liquid flows in a circular torus reactor have been experimentally studied. The goal was to determine the flow structure inside the torus for various volume ratios of the two phases and various circulation velocities. The observed flow patterns are either stratified, dispersed or mixed flows. For the lower rotational speeds, stratified flow is obtained. For the higher speeds, one phase is dispersed within the other, corresponds to the dispersed flow regime. For the moderate speeds, both stratified and dispersed flows coexist in the torus reactor; this de
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Jayawardena, Subash S., Banu Alkaya, Clifford L. Redus, and James P. Brill. "A New Model for Dispersed Multi-Layer Oil-Water Flow." In ASME 2001 Engineering Technology Conference on Energy. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/etce2001-17061.

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Abstract Flow patterns observed in near-horizontal oil-water two-phase flows are quite different from those in gas-liquid flows. Experience with gas-liquid flows suggests that the mechanisms governing the flow behavior are flow-pattern dependent. However, little attention has been given to modeling flow patterns observed only in liquid-liquid systems. Such flow patterns include an oil-in-water dispersion flowing on top of a water layer and the simultaneous flow of dispersions of water-in-oil and oil-in-water as separate layers. A new mechanistic model is developed for one such flow pattern in
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Bultongez, Kevin K., G. A. Riley, and Melanie M. Derby. "Influence of Surface Roughness and Wettability on Oil-Water Flow Regimes in Circular Glass and Stainless Steel Mini-Channels." In ASME 2017 15th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icnmm2017-5541.

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The present study investigates the effects of tube roughness and wettability on oil-water flow regimes in mini channels. The tube material examined included borosilicate glass (i.e., e = 0.1 μm) and stainless steel (i.e., e = 5 μm). Flow patterns and pressure drop were measured and presented for different combinations of oil and water superficial velocities, 0.28–3.36 m/s and 0.07–5 m/s, respectively. Stratified, annular, intermittent, and dispersed flow regimes were observed in all tubes and between tubes, many similarities in flow regime emerged. Tube wettability affected flow regime and flo
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Supak, Kevin, Fuqaio Bai, Eugene Hoffman, Yingda Lu, Heath Noonan, and Kaitlyn Witt. "Two-Phase CO2 Flow Behavior in Horizontal Piping." In 2024 15th International Pipeline Conference. American Society of Mechanical Engineers, 2024. https://doi.org/10.1115/ipc2024-133549.

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Abstract Carbon Capture Utilization and Storage (CCUS) technology relies on the cost-effective transport of CO2 between capture and storage/utilization sites in pipeline networks. The presence of anthropogenic impurities can shift the critical point of the mixture and variation in the ambient temperature can significantly alter the transport behavior, including generating multiphase flow. A flow loop was used to gather pressure drop, liquid holdup, and phase distribution of two-phase CO2 in horizontal 3-inch piping. The data were used to compare to industry flow pattern maps and to validate a
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