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Displaying Results 1  6 of 6 on page 1 of 1
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Bond percolation on multiplex networks
(2016)
Hackett, Adam W.; Cellai, Davide; Gomez, S.; Arenas, A.; Gleeson, James P.
Bond percolation on multiplex networks
(2016)
Hackett, Adam W.; Cellai, Davide; Gomez, S.; Arenas, A.; Gleeson, James P.
Abstract:
We present an analytical approach for bond percolation on multiplex networks and use it to determine the expected size of the giant connected component and the value of the critical bond occupation probability in these networks. We advocate the relevance of these tools to the modeling of multilayer robustness and contribute to the debate on whether any benefit is to be yielded from studying a full multiplex structure as opposed to its monoplex projection, especially in the seemingly irrelevant case of a bond occupation probability that does not depend on the layer. Although we find that in many cases the predictions of our theory for multiplex networks coincide with previously derived results for monoplex networks, we also uncover the remarkable result that for a certain class of multiplex networks, well described by our theory, new critical phenomena occur as multiple percolation phase transitions are present. We provide an instance of this phenomenon in a multiplex network constru...
http://hdl.handle.net/10344/5156
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Cycles and clustering in multiplex networks
(2016)
Baxter, Gareth J.; Cellai, Davide; Dorogovtsev, Sergey N.; Mendes, José F.F.
Cycles and clustering in multiplex networks
(2016)
Baxter, Gareth J.; Cellai, Davide; Dorogovtsev, Sergey N.; Mendes, José F.F.
Abstract:
In multiplex networks, cycles cannot be characterized only by their length, as edges may occur in different layers in different combinations. We define a classification of cycles by the number of edges in each layer and the number of switches between layers. We calculate the expected number of cycles of each type in the configuration model of a large sparse multiplex network. Our method accounts for the full degree distribution including correlations between degrees in different layers. In particular, we obtain the numbers of cycles of length 3 of all possible types. Using these, we give a complete set of clustering coefficients and their expected values. We show that correlations between the degrees of a vertex in different layers strongly affect the number of cycles of a given type, and the number of switches between layers. Both increase with assortative correlations and are strongly decreased by disassortative correlations. The effect of correlations on clustering coefficients i...
http://hdl.handle.net/10344/5545
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Evaluation of peat strength for stability assessments
(2013)
Boylan, Noel; Long, Michael (Michael M.)
Evaluation of peat strength for stability assessments
(2013)
Boylan, Noel; Long, Michael (Michael M.)
Abstract:
n this paper guidance is given for the assessment of peat strength for stability assessments based on laboratory undrained simple shear tests. When considering the stability of peat, these tests will yield a conservative estimation of the in situ strength of the peat mass. The study was motivated by recent interest in renewable energy developments in upland peat areas. The results of more than 111 simple shear tests from 16 sites in Ireland, Scotland and the Netherlands were studied. It was found that the strength of peat is strongly influenced by its stress history, and also varies as a function of the water content and degree of decomposition (fibre content). The normally consolidated normalised strength ratio (s u/σ′v) from simple shear tests of peat was found to be approximately 0·4, which is towards the lower bound of previously published data for peat. Comparisons of strengths derived from simple shear and field vane tests showed that the ratio of the strength derived from the...
http://hdl.handle.net/10197/4894
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Influence of crosssection on the strength of timber beams
(2018)
BahadoriJahromi, A.; Kermani, A.; Zhang, B.; Harte, Annette M.; Bayne, K.; Turner, J.;...
Influence of crosssection on the strength of timber beams
(2018)
BahadoriJahromi, A.; Kermani, A.; Zhang, B.; Harte, Annette M.; Bayne, K.; Turner, J.; Walford, B.
Abstract:
This paper investigates the strength and deformation characteristics of lightweight timber composite beams manufactured with six different crosssectional profiles in comparison with readily available laminated veneer lumber (LVL) and gluedlaminated (Glulam) beams. All engineered profiles comprised solid timber or LVL flanges and threeply plywood webs. The number of webs varied from one to four. The beams had an overall depth of 290 mm and were either 88 mm or 106 mm wide. A study was conducted to provide a comparison of the beam designs and to determine possible effects of crosssectional configuration and connection details on the structural properties of the beams. To enable a realistic analysis, 12 beams were replicated for each design. The individual components of the beams were tested prior to assembly to obtain the modulus of elasticity and shear modulus and were grouped to provide an even distribution of the material properties. The addition of extra webs to the Ibeam pro...
http://hdl.handle.net/10379/8844
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Monitoring and repair of an impact damaged prestressed bridge
(2019)
Pakrashi, Vikram; Harkin, Julie; Kelly, Joe; et al.
Monitoring and repair of an impact damaged prestressed bridge
(2019)
Pakrashi, Vikram; Harkin, Julie; Kelly, Joe; et al.
Abstract:
This paper details the monitoring and repair of an impact damaged prestressed concrete bridge. The repair was required following an impact from a lowloader carrying an excavator while passing underneath the bridge. The repair was carried out by preloading the bridge in the vicinity of the damage to relieve some prestressing. This preload was removed following the hardening and considerable strength gain of the repair material. The true behaviour of damaged prestressed concrete bridges during repair is difficult to estimate theoretically due to a lack of benchmarking and inadequacy of assumed damage models. A network of strain gauges at locations of interest was thus installed during the entire period of repair. Effects of various activities were qualitatively and quantitatively observed. The interaction and rapid, modelfree calibration of damaged and undamaged beams, including identification of damaged gauges, were also probed. This fullscale experiment is expected to be of inter...
http://hdl.handle.net/10197/10424
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Weak percolation on multiplex networks
(2014)
Baxter, Gareth J.; Dorogovtsev, Sergey N.; Mendes, José F.F.; Cellai, Davide
Weak percolation on multiplex networks
(2014)
Baxter, Gareth J.; Dorogovtsev, Sergey N.; Mendes, José F.F.; Cellai, Davide
Abstract:
Bootstrap percolation is a simple but nontrivial model. It has applications in many areas of science and has been explored on random networks for several decades. In singlelayer (simplex) networks, it has been recently observed that bootstrap percolation, which is defined as an incremental process, can be seen as the opposite of pruning percolation, where nodes are removed according to a connectivity rule. Here we propose models of both bootstrap and pruning percolation for multiplex networks. We collectively refer to these two models with the concept of "weak" percolation, to distinguish them from the somewhat classical concept of ordinary ("strong") percolation. While the two models coincide in simplex networks, we show that they decouple when considering multiplexes, giving rise to a wealth of critical phenomena. Our bootstrap model constitutes the simplest example of a contagion process on a multiplex network and has potential applications in critical infras...
http://hdl.handle.net/10344/5544
Displaying Results 1  6 of 6 on page 1 of 1
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Institution
NUI Galway (1)
University College Dublin (2)
University of Limerick (3)
Peer Review Status
Peerreviewed (3)
Unknown (3)
Year
2019 (1)
2018 (1)
2016 (2)
2014 (1)
2013 (1)
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