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\n  \n 2021\n \n \n (6)\n \n \n
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\n \n\n \n \n \n \n \n \n Nature's forms are frilly, flexible, and functional.\n \n \n \n \n\n\n \n Yamamoto, K. K.; Shearman, T. L.; Struckmeyer, E. J.; Gemmer, J. A.; and Venkataramani, S. C.\n\n\n \n\n\n\n The European Physical Journal E, 44(7): 95. 2021.\n \n\n\n\n
\n\n\n\n \n \n \"Nature'sPaper\n  \n \n \n \"Nature's arxiv\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 14 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Yamamoto:2021wk,\n\tabstract = {A ubiquitous motif in nature is the self-similar hierarchical buckling of a thin lamina near its margins. This is seen in leaves, flowers, fungi, corals, and marine invertebrates. We investigate this morphology from the perspective of non-Euclidean plate theory. We identify a novel type of defect, a branch-point of the normal map, that allows for the generation of such complex wrinkling patterns in thin elastic hyperbolic surfaces, even in the absence of stretching. We argue that branch points are the natural defects in hyperbolic sheets, they carry a topological charge which gives them a degree of robustness, and they can influence the overall morphology of a hyperbolic surface without concentrating elastic energy. We develop a theory for branch points and investigate their role in determining the mechanical response of hyperbolic sheets to weak external forces.},\n\tauthor = {Yamamoto, Kenneth K. and Shearman, Toby L. and Struckmeyer, Erik J. and Gemmer, John A. and Venkataramani, Shankar C.},\n\tda = {2021/07/13},\n\tdate-added = {2021-07-18 21:03:52 -0700},\n\tdate-modified = {2021-07-18 21:04:38 -0700},\n\tdoi = {10.1140/epje/s10189-021-00099-6},\n\tid = {Yamamoto2021},\n\tisbn = {1292-895X},\n\tjournal = {The European Physical Journal E},\n\tkeywords = {pubs},\n\tnumber = {7},\n\tpages = {95},\n\ttitle = {Nature's forms are frilly, flexible, and functional},\n\tty = {JOUR},\n\turl = {https://doi.org/10.1140/epje/s10189-021-00099-6},\n\turl_arxiv = {https://arxiv.org/abs/2103.10509},\n\tvolume = {44},\n\tyear = {2021},\n\tBdsk-Url-1 = {https://doi.org/10.1140/epje/s10189-021-00099-6}}\n\n
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\n A ubiquitous motif in nature is the self-similar hierarchical buckling of a thin lamina near its margins. This is seen in leaves, flowers, fungi, corals, and marine invertebrates. We investigate this morphology from the perspective of non-Euclidean plate theory. We identify a novel type of defect, a branch-point of the normal map, that allows for the generation of such complex wrinkling patterns in thin elastic hyperbolic surfaces, even in the absence of stretching. We argue that branch points are the natural defects in hyperbolic sheets, they carry a topological charge which gives them a degree of robustness, and they can influence the overall morphology of a hyperbolic surface without concentrating elastic energy. We develop a theory for branch points and investigate their role in determining the mechanical response of hyperbolic sheets to weak external forces.\n
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\n \n\n \n \n \n \n \n \n Pattern dark matter and galaxy scaling relations.\n \n \n \n \n\n\n \n Venkataramani, S. C.; and Newell, A. C.\n\n\n \n\n\n\n The European Physical Journal Special Topics. 2021.\n \n\n\n\n
\n\n\n\n \n \n \"PatternPaper\n  \n \n \n \"Pattern arxiv\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 12 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Venkataramani:2021tn,\n\tabstract = {We argue that a natural explanation for a variety of robust galaxy scaling relations comes from the perspective of pattern formation and self-organization as a result of symmetry breaking. We propose a simple Lagrangian model that combines a conventional model for normal matter in a galaxy with a conventional model for stripe pattern formation in systems that break continuous translation invariance. We show that the energy stored in the pattern field acts as an effective dark matter. Our theory reproduces the gross features of elliptic galaxies as well as disk galaxies (HSB and LSB) including their detailed rotation curves, the radial acceleration relation, and the Freeman law. We investigate the stability of disk galaxies in the context of our model and obtain scaling relations for the central dispersion for elliptical galaxies. A natural interpretation of our results is that (1) `dark matter'is potentially a collective, emergent phenomenon and not necessarily an as yet undiscovered particle, and (2) MOND is an effective theory for the description of a self-organized complex system rather than a fundamental description of nature that modifies Newton's second law.},\n\tauthor = {Venkataramani, Shankar C. and Newell, Alan C.},\n\tda = {2021/06/18},\n\tdate-added = {2021-07-18 20:58:08 -0700},\n\tdate-modified = {2021-07-18 20:59:43 -0700},\n\tdoi = {10.1140/epjs/s11734-021-00196-9},\n\tid = {Venkataramani2021},\n\tisbn = {1951-6401},\n\tjournal = {The European Physical Journal Special Topics},\n\tkeywords = {pubs},\n\ttitle = {Pattern dark matter and galaxy scaling relations},\n\tty = {JOUR},\n\turl = {https://doi.org/10.1140/epjs/s11734-021-00196-9},\n\turl_arxiv = {https://arxiv.org/abs/2101.08372},\n\tyear = {2021},\n\tBdsk-Url-1 = {https://doi.org/10.1140/epjs/s11734-021-00196-9}}\n\n
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\n We argue that a natural explanation for a variety of robust galaxy scaling relations comes from the perspective of pattern formation and self-organization as a result of symmetry breaking. We propose a simple Lagrangian model that combines a conventional model for normal matter in a galaxy with a conventional model for stripe pattern formation in systems that break continuous translation invariance. We show that the energy stored in the pattern field acts as an effective dark matter. Our theory reproduces the gross features of elliptic galaxies as well as disk galaxies (HSB and LSB) including their detailed rotation curves, the radial acceleration relation, and the Freeman law. We investigate the stability of disk galaxies in the context of our model and obtain scaling relations for the central dispersion for elliptical galaxies. A natural interpretation of our results is that (1) `dark matter'is potentially a collective, emergent phenomenon and not necessarily an as yet undiscovered particle, and (2) MOND is an effective theory for the description of a self-organized complex system rather than a fundamental description of nature that modifies Newton's second law.\n
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\n \n\n \n \n \n \n \n \n Computing with non-orientable defects: Nematics, smectics and natural patterns.\n \n \n \n \n\n\n \n Zhang, C.; Acharya, A.; Newell, A. C.; and Venkataramani, S. C.\n\n\n \n\n\n\n Physica D: Nonlinear Phenomena, 417: 132828. 2021.\n \n\n\n\n
\n\n\n\n \n \n \"ComputingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 7 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Zhang20211Computing,\n\tabstract = {Defects are a ubiquitous feature of ordered media. They have certain universal features, independent of the underlying physical system, reflecting their topological origins. While the topological properties of defects are robust, they appear as `unphysical' singularities, with non-integrable energy densities in coarse-grained macroscopic models. We develop a principled approach for enriching coarse-grained theories with enough of the `micro-physics' to obtain thermodynamically consistent, well-set models that allow for the investigations of dynamics and interactions of defects in extended systems. We also develop associated numerical methods that are applicable to computing energy driven behaviors of defects across the amorphous-soft-crystalline materials spectrum. Our methods can handle order parameters that have a head-tail symmetry, i.e. director fields, in systems with a continuous translation symmetry, as in nematic liquid crystals, and in systems where the translation symmetry is broken, as in smectics and convection patterns. We illustrate our methods with explicit computations.},\n\tauthor = {Chiqun Zhang and Amit Acharya and Alan C. Newell and Shankar C. Venkataramani},\n\tdate-added = {2021-05-29 14:50:02 -0700},\n\tdate-modified = {2021-05-29 14:50:42 -0700},\n\tdoi = {https://doi.org/10.1016/j.physd.2020.132828},\n\tissn = {0167-2789},\n\tjournal = {Physica D: Nonlinear Phenomena},\n\tkeywords = {pubs,Defects in materials, Non-orientability, Effective theories, Liquid crystals, Pattern formation, Computation of defects},\n\tpages = {132828},\n\ttitle = {Computing with non-orientable defects: Nematics, smectics and natural patterns},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0167278920308290},\n\tvolume = {417},\n\tyear = {2021},\n\tBdsk-Url-1 = {https://www.sciencedirect.com/science/article/pii/S0167278920308290},\n\tBdsk-Url-2 = {https://doi.org/10.1016/j.physd.2020.132828}}\n\n
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\n Defects are a ubiquitous feature of ordered media. They have certain universal features, independent of the underlying physical system, reflecting their topological origins. While the topological properties of defects are robust, they appear as `unphysical' singularities, with non-integrable energy densities in coarse-grained macroscopic models. We develop a principled approach for enriching coarse-grained theories with enough of the `micro-physics' to obtain thermodynamically consistent, well-set models that allow for the investigations of dynamics and interactions of defects in extended systems. We also develop associated numerical methods that are applicable to computing energy driven behaviors of defects across the amorphous-soft-crystalline materials spectrum. Our methods can handle order parameters that have a head-tail symmetry, i.e. director fields, in systems with a continuous translation symmetry, as in nematic liquid crystals, and in systems where the translation symmetry is broken, as in smectics and convection patterns. We illustrate our methods with explicit computations.\n
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\n \n\n \n \n \n \n \n \n A Modified Split Bregman Algorithm for Computing Microstructures Through Young Measures.\n \n \n \n \n\n\n \n Jaramillo, G.; and Venkataramani, S. C.\n\n\n \n\n\n\n Multiscale Modeling & Simulation, 19(2): 886-920. 2021.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n \n \"A arxiv\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 5 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{jaramillo2019microstructure,\n\tauthor = {Jaramillo, Gabriela and Venkataramani, Shankar C.},\n\tdate-added = {2021-05-29 14:38:32 -0700},\n\tdate-modified = {2021-05-29 14:39:29 -0700},\n\tdoi = {10.1137/19M1306907},\n\teprint = {https://doi.org/10.1137/19M1306907},\n\tjournal = {Multiscale Modeling \\& Simulation},\n\tkeywords = {pubs},\n\tnumber = {2},\n\tpages = {886-920},\n\ttitle = {A Modified Split Bregman Algorithm for Computing Microstructures Through Young Measures},\n\turl = {https://doi.org/10.1137/19M1306907},\n\turl_arxiv = {https://arxiv.org/abs/1912.03360},\n\tvolume = {19},\n\tyear = {2021},\n\tBdsk-Url-1 = {https://doi.org/10.1137/19M1306907}}\n\n
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\n \n\n \n \n \n \n \n \n Distributed Branch Points and the Shape of Elastic Surfaces with Constant Negative Curvature.\n \n \n \n \n\n\n \n Shearman, T. L; and Venkataramani, S. C\n\n\n \n\n\n\n Journal of Nonlinear Science, 31(1): 1–60. 2021.\n \n\n\n\n
\n\n\n\n \n \n \"Distributed arxiv\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 4 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{shearman2021distributed,\n\tauthor = {Shearman, Toby L and Venkataramani, Shankar C},\n\tdate-added = {2021-05-23 19:13:38 -0700},\n\tdate-modified = {2021-05-23 19:14:52 -0700},\n\tjournal = {Journal of Nonlinear Science},\n\tkeywords = {pubs},\n\tnumber = {1},\n\tpages = {1--60},\n\tpublisher = {Springer},\n\ttitle = {Distributed Branch Points and the Shape of Elastic Surfaces with Constant Negative Curvature},\n\turl_arxiv = {https://arxiv.org/abs/2006.14461},\n\tvolume = {31},\n\tyear = {2021}}\n\n
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\n \n\n \n \n \n \n \n \n Disk galaxies and their dark halos as self-organized patterns.\n \n \n \n \n\n\n \n Venkataramani, S. C.; and Newell, A. C.\n\n\n \n\n\n\n Physics Letters B, 813: 136060. 2021.\n \n\n\n\n
\n\n\n\n \n \n \"DiskPaper\n  \n \n \n \"Disk arxiv\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 6 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{PatternDM,\n\tabstract = {Galaxies are built by complex physical processes with significant inherent stochasticity. It is therefore surprising that the inferred dark matter distributions in galaxies are correlated with the observed baryon distributions leading to various `Baryon-Halo conspiracies'. The fact that no dark matter candidate has been definitively identified invites a search for alternative explanations for such correlations and we present an approach motivated by the behaviors of self organized patterns. We propose a nonlocal relativistic Lagrangian theory for a `pattern field' which acts as an `effective dark matter', built on the idea that defects in this pattern field couple to the baryonic matter distribution. The model applies to rotation supported systems and, for them, we compute galactic rotation curves, obtain a radial acceleration relation with two branches, and deduce the Freeman limit for central surface brightness.},\n\tauthor = {Shankar C. Venkataramani and Alan C. Newell},\n\tdate-added = {2021-05-23 19:11:31 -0700},\n\tdate-modified = {2021-05-23 19:17:57 -0700},\n\tdoi = {https://doi.org/10.1016/j.physletb.2020.136060},\n\tissn = {0370-2693},\n\tjournal = {Physics Letters B},\n\tkeywords = {pubs,Self-organized patterns, Symmetry breaking, Defects, Dark matter, Galaxy scaling relations},\n\tpages = {136060},\n\ttitle = {Disk galaxies and their dark halos as self-organized patterns},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0370269320308637},\n\turl_arxiv = {https://arxiv.org/abs/1910.14649},\n\tvolume = {813},\n\tyear = {2021},\n\tBdsk-Url-1 = {https://www.sciencedirect.com/science/article/pii/S0370269320308637},\n\tBdsk-Url-2 = {https://doi.org/10.1016/j.physletb.2020.136060}}\n\n
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\n Galaxies are built by complex physical processes with significant inherent stochasticity. It is therefore surprising that the inferred dark matter distributions in galaxies are correlated with the observed baryon distributions leading to various `Baryon-Halo conspiracies'. The fact that no dark matter candidate has been definitively identified invites a search for alternative explanations for such correlations and we present an approach motivated by the behaviors of self organized patterns. We propose a nonlocal relativistic Lagrangian theory for a `pattern field' which acts as an `effective dark matter', built on the idea that defects in this pattern field couple to the baryonic matter distribution. The model applies to rotation supported systems and, for them, we compute galactic rotation curves, obtain a radial acceleration relation with two branches, and deduce the Freeman limit for central surface brightness.\n
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\n \n\n \n \n \n \n \n \n Mechanics of moving defects in growing sheets: 3-d, small deformation theory.\n \n \n \n \n\n\n \n Acharya, A.; and Venkataramani, S. C.\n\n\n \n\n\n\n Materials Theory, 4(1): 2. 2020.\n \n\n\n\n
\n\n\n\n \n \n \"MechanicsPaper\n  \n \n \n \"Mechanics arxiv\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 4 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Acharya2020mechanics,\n\tabstract = {Growth and other dynamical processes in soft materials can create novel types of mesoscopic defects including discontinuities for the second and higher derivatives of the deformation, and terminating defects for these discontinuities. These higher-order defects move ``easily", and can thus confer a great degree of flexibility to the material. We develop a general continuum mechanical framework from which we can derive the dynamics of higher order defects in a thermodynamically consistent manner. We illustrate our framework by obtaining the explicit dynamical equations for the next higher order defects in an elastic body beyond dislocations, phase boundaries, and disclinations, namely, surfaces of inflection and branch lines.},\n\tauthor = {Acharya, Amit and Venkataramani, Shankar C.},\n\tda = {2020/04/16},\n\tdate-added = {2020-05-25 22:56:27 -0700},\n\tdate-modified = {2020-05-25 23:08:19 -0700},\n\tdoi = {10.1186/s41313-020-00018-w},\n\tid = {Acharya2020},\n\tisbn = {2509-8012},\n\tjournal = {Materials Theory},\n\tkeywords = {pubs},\n\tnumber = {1},\n\tpages = {2},\n\ttitle = {Mechanics of moving defects in growing sheets: 3-d, small deformation theory},\n\tty = {JOUR},\n\turl = {https://doi.org/10.1186/s41313-020-00018-w},\n\turl_arxiv = {https://arxiv.org/abs/1906.08122},\n\tvolume = {4},\n\tyear = {2020},\n\tBdsk-Url-1 = {https://doi.org/10.1186/s41313-020-00018-w}}\n\n
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\n Growth and other dynamical processes in soft materials can create novel types of mesoscopic defects including discontinuities for the second and higher derivatives of the deformation, and terminating defects for these discontinuities. These higher-order defects move ``easily\", and can thus confer a great degree of flexibility to the material. We develop a general continuum mechanical framework from which we can derive the dynamics of higher order defects in a thermodynamically consistent manner. We illustrate our framework by obtaining the explicit dynamical equations for the next higher order defects in an elastic body beyond dislocations, phase boundaries, and disclinations, namely, surfaces of inflection and branch lines.\n
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\n \n\n \n \n \n \n \n \n On the Growth of a Superlinear Preferential Attachment Scheme.\n \n \n \n \n\n\n \n Sethuraman, S.; and Venkataramani, S. C.\n\n\n \n\n\n\n In Friz, P.; König, W.; Mukherjee, C.; and Olla, S., editor(s), Probability and Analysis in Interacting Physical Systems, pages 243–265, Cham, 2019. Springer International Publishing\n \n\n\n\n
\n\n\n\n \n \n \"OnPaper\n  \n \n \n \"On arxiv\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@inproceedings{Sethuraman2019growth,\n\tabstract = {We consider an evolving preferential attachment random graph model where at discrete times a new node is attached to an old node, selected with probability proportional to a superlinear function of its degree. For such schemes, it is known that the graph evolution condenses, that is a.s. in the limit graph there will be a single random node with infinite degree, while all others have finite degree. In this note, we establish a.s. law of large numbers type limits and fluctuation results, as {\\$}{\\$}n{$\\backslash$}uparrow {$\\backslash$}infty {\\$}{\\$}, for the counts of the number of nodes with degree {\\$}{\\$}k{$\\backslash$}ge 1{\\$}{\\$}at time {\\$}{\\$}n{$\\backslash$}ge 1{\\$}{\\$}. These limits rigorously verify and extend a physical picture of Krapivisky et al. (Phys Rev Lett 85:4629--4632, 2000 {$[$}16{$]$}) on how the condensation arises with respect to the degree distribution.},\n\taddress = {Cham},\n\tauthor = {Sethuraman, Sunder and Venkataramani, Shankar C.},\n\tbooktitle = {Probability and Analysis in Interacting Physical Systems},\n\tda = {2019//},\n\tdate-added = {2019-11-04 23:11:43 -0700},\n\tdate-modified = {2019-11-04 23:14:02 -0700},\n\teditor = {Friz, Peter and K{\\"o}nig, Wolfgang and Mukherjee, Chiranjib and Olla, Stefano},\n\tid = {10.1007/978-3-030-15338-0{\\_}9},\n\tisbn = {978-3-030-15338-0},\n\tkeywords = {pubs},\n\tpages = {243--265},\n\tpublisher = {Springer International Publishing},\n\ttitle = {On the Growth of a Superlinear Preferential Attachment Scheme},\n\tty = {CONF},\n\turl = {https://link.springer.com/chapter/10.1007/978-3-030-15338-0_9},\n\turl_arxiv = {https://arxiv.org/abs/1704.05568},\n\tyear = {2019},\n\tBdsk-Url-1 = {https://link.springer.com/chapter/10.1007/978-3-030-15338-0_9}}\n\n
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\n We consider an evolving preferential attachment random graph model where at discrete times a new node is attached to an old node, selected with probability proportional to a superlinear function of its degree. For such schemes, it is known that the graph evolution condenses, that is a.s. in the limit graph there will be a single random node with infinite degree, while all others have finite degree. In this note, we establish a.s. law of large numbers type limits and fluctuation results, as $}{$n$\\$uparrow $\\$infty $}{$, for the counts of the number of nodes with degree $}{$k$\\$ge 1$}{$at time $}{$n$\\$ge 1$}{$. These limits rigorously verify and extend a physical picture of Krapivisky et al. (Phys Rev Lett 85:4629–4632, 2000 $[$16$]$) on how the condensation arises with respect to the degree distribution.\n
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\n \n\n \n \n \n \n \n \n Pattern universes.\n \n \n \n \n\n\n \n Newell, A. C.; and Venkataramani, S. C.\n\n\n \n\n\n\n Comptes Rendus Mécanique, 347(4): 318 - 331. 2019.\n Patterns and dynamics: homage to Pierre Coullet / Formes et dynamique: hommage à Pierre Coullet\n\n\n\n
\n\n\n\n \n \n \"Pattern arxiv\n  \n \n \n \"Pattern journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 3 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{NV19,\n\tabstract = {In this essay we explore analogies between macroscopic patterns, which result from a sequence of phase transitions/instabilities starting from a homogeneous state, and similar phenomena in cosmology, where a sequence of phase transitions in the early universe is believed to have separated the fundamental forces from each other, and also shaped the structure and distribution of matter in the universe. We discuss three distinct aspects of this analogy: (i) Defects and topological charges in macroscopic patterns are analogous to spins and charges of quarks and leptons; (ii) Defects in generic 3+1 stripe patterns carry an energy density that accounts for phenomena that are currently attributed to dark matter; (iii) Space-time patterns of interacting nonlinear waves display behaviors reminiscent of quantum phenomena including inflation, entanglement and dark energy.\nR{\\'e}sum{\\'e}\nDans cet article, nous explorons plusieurs analogies entre la formation de structures p{\\'e}riodiques macroscopiques, qui r{\\'e}sultent de la succession de transitions de phase ou d'instabilit{\\'e}s, et certains ph{\\'e}nom{\\`e}nes similaires en cosmologie, o{\\`u} une suite de transitions de phase dans l'univers primordial aurait donn{\\'e} lieu {\\`a} la s{\\'e}paration des forces fondamentales et {\\`a} la formation des structures. Nous consid{\\'e}rons trois analogies diff{\\'e}rentes : (i) les d{\\'e}fauts et charges topologiques dans les structures macroscopiques sont analogues aux spins et charges des quarks et des leptons ; (ii) les d{\\'e}fauts dans les structures p{\\'e}riodiques g{\\'e}n{\\'e}riques (en dimensions 3+1) ont une densit{\\'e} d'{\\'e}nergie qui donne lieu {\\`a} certains ph{\\'e}nom{\\`e}nes attribu{\\'e}s {\\`a} la pr{\\'e}sence de mati{\\`e}re noire ; (iii) les structures spatio-temporelles r{\\'e}sultant de l'interaction d'ondes non lin{\\'e}aires ont des comportements qui rappellent certains ph{\\'e}nom{\\`e}nes quantiques, tels que l'inflation cosmique, l'enchev{\\^e}trement quantique et l'{\\'e}nergie noire.},\n\tauthor = {Alan C. Newell and Shankar C. Venkataramani},\n\tdate-added = {2019-11-04 23:01:37 -0700},\n\tdate-modified = {2019-11-04 23:03:49 -0700},\n\tdoi = {https://doi.org/10.1016/j.crme.2019.03.004},\n\tissn = {1631-0721},\n\tjournal = {Comptes Rendus M{\\'e}canique},\n\tkeywords = {pubs,Pattern formation, Cosmology, Phase transitions, Formation de motifs, Cosmologie, Transition de phase},\n\tnote = {Patterns and dynamics: homage to Pierre Coullet / Formes et dynamique: hommage {\\`a} Pierre Coullet},\n\tnumber = {4},\n\tpages = {318 - 331},\n\ttitle = {Pattern universes},\n\turl_arxiv = {https://arxiv.org/abs/1811.10546},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S1631072119300464},\n\tvolume = {347},\n\tyear = {2019},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S1631072119300464},\n\tBdsk-Url-2 = {https://doi.org/10.1016/j.crme.2019.03.004}}\n\n
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\n In this essay we explore analogies between macroscopic patterns, which result from a sequence of phase transitions/instabilities starting from a homogeneous state, and similar phenomena in cosmology, where a sequence of phase transitions in the early universe is believed to have separated the fundamental forces from each other, and also shaped the structure and distribution of matter in the universe. We discuss three distinct aspects of this analogy: (i) Defects and topological charges in macroscopic patterns are analogous to spins and charges of quarks and leptons; (ii) Defects in generic 3+1 stripe patterns carry an energy density that accounts for phenomena that are currently attributed to dark matter; (iii) Space-time patterns of interacting nonlinear waves display behaviors reminiscent of quantum phenomena including inflation, entanglement and dark energy. Résumé Dans cet article, nous explorons plusieurs analogies entre la formation de structures périodiques macroscopiques, qui résultent de la succession de transitions de phase ou d'instabilités, et certains phénomènes similaires en cosmologie, où une suite de transitions de phase dans l'univers primordial aurait donné lieu à la séparation des forces fondamentales et à la formation des structures. Nous considérons trois analogies différentes : (i) les défauts et charges topologiques dans les structures macroscopiques sont analogues aux spins et charges des quarks et des leptons ; (ii) les défauts dans les structures périodiques génériques (en dimensions 3+1) ont une densité d'énergie qui donne lieu à certains phénomènes attribués à la présence de matière noire ; (iii) les structures spatio-temporelles résultant de l'interaction d'ondes non linéaires ont des comportements qui rappellent certains phénomènes quantiques, tels que l'inflation cosmique, l'enchevêtrement quantique et l'énergie noire.\n
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\n \n\n \n \n \n \n \n \n Buckling sheets open a door to understanding self-organization in soft matter.\n \n \n \n \n\n\n \n Venkataramani, S. C.\n\n\n \n\n\n\n Proceedings of the National Academy of Sciences, 116(5): 1477–1479. January 2019.\n \n\n\n\n
\n\n\n\n \n \n \"BucklingPaper\n  \n \n \n \"Buckling arxiv\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{2019a,\n\tauthor = {Venkataramani, Shankar C.},\n\tdate-added = {2019-03-20 20:33:42 -0700},\n\tdate-modified = {2019-03-20 20:35:03 -0700},\n\tdoi = {10.1073/pnas.1820937116},\n\teprint = {https://www.pnas.org/content/116/5/1477.full.pdf},\n\tissn = {0027-8424},\n\tjournal = {Proceedings of the National Academy of Sciences},\n\tkeywords = {pubs},\n\tmonth = {January},\n\tnumber = {5},\n\tpages = {1477--1479},\n\tpublisher = {National Academy of Sciences},\n\ttitle = {Buckling sheets open a door to understanding self-organization in soft matter},\n\turl = {https://www.pnas.org/content/116/5/1477},\n\turl_arxiv = {https://arxiv.org/abs/1901.03032},\n\tvolume = {116},\n\tyear = {2019},\n\tBdsk-Url-1 = {https://www.pnas.org/content/116/5/1477},\n\tBdsk-Url-2 = {https://doi.org/10.1073/pnas.1820937116}}\n\n
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\n \n\n \n \n \n \n \n \n Modelling the mass exchange dynamics of oceanic surface and subsurface oil.\n \n \n \n \n\n\n \n Ramírez, J.; Moghimi, S.; Restrepo, J. M.; and Venkataramani, S.\n\n\n \n\n\n\n Ocean Modelling, 129: 1 - 12. September 2018.\n \n\n\n\n
\n\n\n\n \n \n \"ModellingPaper\n  \n \n \n \"Modelling arxiv\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{2018b,\n\tabstract = {We propose a time dependent Eulerian model for sea surface entrainment, buoyancy transport and droplet dynamics of ocean oil. The model captures the microscale vertical oil mass exchanges in the neighborhood of the sea surface. This model is in turn part of an oil fate model designed to capture oil dynamics at large spatio-temporal scales typical of environmental studies. The adiabatic dynamics of the droplets are upscaled by a combination of filtering and stochastic parametrization. The upscaling addresses the computational burden of resolving the microscale. The upscaled droplet dynamics are tested against data and the mass exchange mechanism is incorporated into a nearshore oil transport model in order to highlight the importance of incorporating vertical mass exchanges and droplet distribution dynamics in predicting the distributing of shoaling oil.},\n\tauthor = {Jorge Ram\\'{i}rez and Saeed Moghimi and Juan M. Restrepo and Shankar Venkataramani},\n\tdate-added = {2019-03-20 20:59:16 -0700},\n\tdate-modified = {2019-03-20 21:42:06 -0700},\n\tdoi = {https://doi.org/10.1016/j.ocemod.2018.06.004},\n\tissn = {1463-5003},\n\tjournal = {Ocean Modelling},\n\tkeywords = {Oil spill; Oil fate model; Oil entrainment; Ocean oil transport; Ocean pollution; pubs},\n\tmonth = {September},\n\tpages = {1 - 12},\n\ttitle = {Modelling the mass exchange dynamics of oceanic surface and subsurface oil},\n\turl = {http://www.sciencedirect.com/science/article/pii/S1463500318302087},\n\turl_arxiv = {https://arxiv.org/abs/1703.05361},\n\tvolume = {129},\n\tyear = {2018},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S1463500318302087},\n\tBdsk-Url-2 = {https://doi.org/10.1016/j.ocemod.2018.06.004}}\n\n
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\n We propose a time dependent Eulerian model for sea surface entrainment, buoyancy transport and droplet dynamics of ocean oil. The model captures the microscale vertical oil mass exchanges in the neighborhood of the sea surface. This model is in turn part of an oil fate model designed to capture oil dynamics at large spatio-temporal scales typical of environmental studies. The adiabatic dynamics of the droplets are upscaled by a combination of filtering and stochastic parametrization. The upscaling addresses the computational burden of resolving the microscale. The upscaled droplet dynamics are tested against data and the mass exchange mechanism is incorporated into a nearshore oil transport model in order to highlight the importance of incorporating vertical mass exchanges and droplet distribution dynamics in predicting the distributing of shoaling oil.\n
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\n \n\n \n \n \n \n \n \n Target patterns in a 2D array of oscillators with nonlocal coupling.\n \n \n \n \n\n\n \n Jaramillo, G.; and Venkataramani, S. C\n\n\n \n\n\n\n Nonlinearity, 31(9): 4162-4201. 2018.\n \n\n\n\n
\n\n\n\n \n \n \"Target arxiv\n  \n \n \n \"Target journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{jaramillo2018target,\n\tabstract = {We analyze the effect of adding a weak, localized, inhomogeneity to a two dimensional array of oscillators with nonlocal coupling. We propose and also justify a model for the phase dynamics in this system. Our model is a generalization of a viscous eikonal equation that is known to describe the phase modulation of traveling waves in reaction--diffusion systems. We show the existence of a branch of target pattern solutions that bifurcates from the spatially homogeneous state when , the strength of the inhomogeneity, is nonzero and we also show that these target patterns have an asymptotic wavenumber that is small beyond all orders in . The strategy of our proof is to pose a good ansatz for an approximate form of the solution and use the implicit function theorem to prove the existence of a solution in its vicinity. The analysis presents two challenges. First, the linearization about the homogeneous state is a convolution operator of diffusive type and hence not invertible on the usual Sobolev spaces. Second, a regular perturbation expansion in  does not provide a good ansatz for applying the implicit function theorem since the nonlinearities play a major role in determining the relevant approximation, which also needs to be `correct' to all orders in . We overcome these two points by proving Fredholm properties for the linearization in appropriate Kondratiev spaces and using a refined ansatz for the approximate solution which was obtained using matched asymptotics.},\n\tauthor = {Jaramillo, Gabriela and Venkataramani, Shankar C},\n\tda = {2018/07/27},\n\tdate-added = {2019-03-20 14:49:42 -0700},\n\tdate-modified = {2019-03-20 15:07:42 -0700},\n\tdoi = {10.1088/1361-6544/aac9a6},\n\tisbn = {0951-7715; 1361-6544},\n\tjournal = {Nonlinearity},\n\tkeywords = {pubs},\n\tnumber = {9},\n\tpages = {4162-4201},\n\tpublisher = {IOP Publishing},\n\ttitle = {Target patterns in a 2D array of oscillators with nonlocal coupling},\n\tty = {JOUR},\n\turl_arxiv = {https://arxiv.org/abs/1706.00524},\n\turl_journal = {https://iopscience.iop.org/article/10.1088/1361-6544/aac9a6/pdf},\n\tvolume = {31},\n\tyear = {2018},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1088/1361-6544/aac9a6}}\n\n
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\n We analyze the effect of adding a weak, localized, inhomogeneity to a two dimensional array of oscillators with nonlocal coupling. We propose and also justify a model for the phase dynamics in this system. Our model is a generalization of a viscous eikonal equation that is known to describe the phase modulation of traveling waves in reaction–diffusion systems. We show the existence of a branch of target pattern solutions that bifurcates from the spatially homogeneous state when , the strength of the inhomogeneity, is nonzero and we also show that these target patterns have an asymptotic wavenumber that is small beyond all orders in . The strategy of our proof is to pose a good ansatz for an approximate form of the solution and use the implicit function theorem to prove the existence of a solution in its vicinity. The analysis presents two challenges. First, the linearization about the homogeneous state is a convolution operator of diffusive type and hence not invertible on the usual Sobolev spaces. Second, a regular perturbation expansion in does not provide a good ansatz for applying the implicit function theorem since the nonlinearities play a major role in determining the relevant approximation, which also needs to be `correct' to all orders in . We overcome these two points by proving Fredholm properties for the linearization in appropriate Kondratiev spaces and using a refined ansatz for the approximate solution which was obtained using matched asymptotics.\n
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\n \n\n \n \n \n \n \n \n Elastic sheets, phase surfaces and pattern universes.\n \n \n \n \n\n\n \n Newell, A. C.; and Venkataramani, S. C.\n\n\n \n\n\n\n Studies in Applied Mathematics, 139(2): 322–368. 2017.\n \n\n\n\n
\n\n\n\n \n \n \"Elastic arxiv\n  \n \n \n \"Elastic journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{pattern-universe,\n\tabstract = {We connect the theories of the deformation of elastic surfaces and phase surfaces arising in the description of almost periodic patterns. In particular, we show striking parallels between expansions for the energy of elastic surfaces in powers of the thickness h and the free energy averaged over a period of an almost periodic pattern expanded in powers of ϵ, the inverse aspect ratio of the pattern field. In both cases, the resulting energy can be expressed in terms of the first and second fundamental forms of the surfaces involved, the elastic surface in the former case and the phase surface in the latter. We discuss various results that are obtained by exploiting this analogy and also address some of the outstanding questions. One common result of particular interest concerns the condensation of the Gaussian curvature onto isolated point defects in two dimensions and onto loop filaments in three dimensions. \n\nWe also lay out an ambitious and somewhat speculative program to build a multi-scale model of the universe inspired by patterns, in which the short (spatial and temporal) scale structure on the Planck scales is given by a nearly periodic microstructure, and macroscopic/slowly varying/averaged behaviors on scales much larger than the Planck scale leads to a hierarchy of structures and features including analogues of quarks, leptons, dark matter, dark energy and inflationary cosmology.\n},\n\tauthor = {Alan C. Newell and Shankar C. Venkataramani},\n\tdate-added = {2017-10-15 18:02:26 +0000},\n\tdate-modified = {2017-10-15 18:15:10 +0000},\n\tdoi = {http://onlinelibrary.wiley.com/doi/10.1111/sapm.12184/full},\n\tjournal = {Studies in Applied Mathematics},\n\tkeywords = {pubs},\n\tnumber = {2},\n\tpages = {322--368},\n\ttitle = {Elastic sheets, phase surfaces and pattern universes},\n\turl_arxiv = {arxiv.org/abs/1612.01007},\n\turl_journal = {http://onlinelibrary.wiley.com/doi/10.1111/sapm.12184/full},\n\tvolume = {139},\n\tyear = {2017},\n\tBdsk-Url-1 = {http://onlinelibrary.wiley.com/doi/10.1111/sapm.12184/full}}\n\n
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\n We connect the theories of the deformation of elastic surfaces and phase surfaces arising in the description of almost periodic patterns. In particular, we show striking parallels between expansions for the energy of elastic surfaces in powers of the thickness h and the free energy averaged over a period of an almost periodic pattern expanded in powers of ϵ, the inverse aspect ratio of the pattern field. In both cases, the resulting energy can be expressed in terms of the first and second fundamental forms of the surfaces involved, the elastic surface in the former case and the phase surface in the latter. We discuss various results that are obtained by exploiting this analogy and also address some of the outstanding questions. One common result of particular interest concerns the condensation of the Gaussian curvature onto isolated point defects in two dimensions and onto loop filaments in three dimensions. We also lay out an ambitious and somewhat speculative program to build a multi-scale model of the universe inspired by patterns, in which the short (spatial and temporal) scale structure on the Planck scales is given by a nearly periodic microstructure, and macroscopic/slowly varying/averaged behaviors on scales much larger than the Planck scale leads to a hierarchy of structures and features including analogues of quarks, leptons, dark matter, dark energy and inflationary cosmology. \n
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\n \n\n \n \n \n \n \n \n Dimension Reduction for Systems with Slow Relaxation.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Venkataramani, R. C.; and Restrepo, J. M.\n\n\n \n\n\n\n Journal of Statistical Physics, 167(3): 892–933. 2017.\n \n\n\n\n
\n\n\n\n \n \n \"Dimension arxiv\n  \n \n \n \"Dimension journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Venkataramani:2017aa,\n\tabstract = {We develop reduced, stochastic models for high dimensional, dissipative dynamical systems that relax very slowly to equilibrium and can encode long term memory. We present a variety of empirical and first principles approaches for model reduction, and build a mathematical framework for analyzing the reduced models. We introduce the notions of universal and asymptotic filters to characterize `optimal'model reductions for sloppy linear models. We illustrate our methods by applying them to the practically important problem of modeling evaporation in oil spills.},\n\tauthor = {Venkataramani, Shankar C. and Venkataramani, Raman C. and Restrepo, Juan M.},\n\tda = {2017//},\n\tdate-added = {2017-05-01 21:34:13 +0000},\n\tdate-modified = {2017-05-02 18:16:58 +0000},\n\tdoi = {10.1007/s10955-017-1761-7},\n\tid = {Venkataramani2017},\n\tisbn = {1572-9613},\n\tjournal = {Journal of Statistical Physics},\n\tkeywords = {pubs},\n\tnumber = {3},\n\tpages = {892--933},\n\ttitle = {Dimension Reduction for Systems with Slow Relaxation},\n\tty = {JOUR},\n\turl_arxiv = {http://arxiv.org/abs/1609.09222},\n\turl_journal = {http://dx.doi.org/10.1007/s10955-017-1761-7},\n\tvolume = {167},\n\tyear = {2017},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1007/s10955-017-1761-7}}\n\n
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\n We develop reduced, stochastic models for high dimensional, dissipative dynamical systems that relax very slowly to equilibrium and can encode long term memory. We present a variety of empirical and first principles approaches for model reduction, and build a mathematical framework for analyzing the reduced models. We introduce the notions of universal and asymptotic filters to characterize `optimal'model reductions for sloppy linear models. We illustrate our methods by applying them to the practically important problem of modeling evaporation in oil spills.\n
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\n \n\n \n \n \n \n \n \n Displacement data assimilation.\n \n \n \n \n\n\n \n Rosenthal, W. S.; Venkataramani, S.; Mariano, A. J.; and Restrepo, J. M.\n\n\n \n\n\n\n Journal of Computational Physics, 330: 594 - 614. 2017.\n \n\n\n\n
\n\n\n\n \n \n \"Displacement arxiv\n  \n \n \n \"Displacement journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Rosenthal_Displacement_2017,\n\tabstract = {Abstract We show that modifying a Bayesian data assimilation scheme by incorporating kinematically-consistent displacement corrections produces a scheme that is demonstrably better at estimating partially observed state vectors in a setting where feature information is important. While the displacement transformation is generic, here we implement it within an ensemble Kalman Filter framework and demonstrate its effectiveness in tracking stochastically perturbed vortices. },\n\tauthor = {W. Steven Rosenthal and Shankar Venkataramani and Arthur J. Mariano and Juan M. Restrepo},\n\tdate-added = {2017-01-29 16:07:29 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/j.jcp.2016.10.025},\n\tissn = {0021-9991},\n\tjournal = {Journal of Computational Physics},\n\tkeywords = {Displacement assimilation; Data assimilation; Uncertainty quantification; Ensemble Kalman Filter; Vortex dynamics; pubs},\n\tpages = {594 - 614},\n\ttitle = {Displacement data assimilation},\n\turl_arxiv = {https://arxiv.org/abs/1602.02209},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S002199911630523X},\n\tvolume = {330},\n\tyear = {2017},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1016/j.jcp.2016.10.025},\n\tBdsk-Url-2 = {http://www.sciencedirect.com/science/article/pii/S002199911630523X}}\n\n
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\n Abstract We show that modifying a Bayesian data assimilation scheme by incorporating kinematically-consistent displacement corrections produces a scheme that is demonstrably better at estimating partially observed state vectors in a setting where feature information is important. While the displacement transformation is generic, here we implement it within an ensemble Kalman Filter framework and demonstrate its effectiveness in tracking stochastically perturbed vortices. \n
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\n \n\n \n \n \n \n \n \n Stochastic longshore current dynamics.\n \n \n \n \n\n\n \n Restrepo, J. M.; and Venkataramani, S.\n\n\n \n\n\n\n Advances in Water Resources, 98: 186–197. 12 2016.\n \n\n\n\n
\n\n\n\n \n \n \"Stochastic arxiv\n  \n \n \n \"Stochastic journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{AdWR_2016,\n\tabstract = {Abstract We develop a stochastic parametrization, based on a `simple' deterministic model for the dynamics of steady longshore currents, that produces ensembles that are statistically consistent with field observations of these currents. Unlike deterministic models, stochastic parameterization incorporates randomness and hence can only match the observations in a statistical sense. Unlike statistical emulators, in which the model is tuned to the statistical structure of the observation, stochastic parametrization are not directly tuned to match the statistics of the observations. Rather, stochastic parameterization combines deterministic, i.e physics based models with stochastic models for the ``missing physics'' to create hybrid models, that are stochastic, but yet can be used for making predictions, especially in the context of data assimilation.  We introduce a novel measure of the utility of stochastic models of complex processes, that we call consistency of sensitivity. A model with poor consistency of sensitivity requires a great deal of tuning of parameters and has a very narrow range of realistic parameters leading to outcomes consistent with a reasonable spectrum of physical outcomes. We apply this metric to our stochastic parametrization and show that, the loss of certainty inherent in model due to its stochastic nature is offset by the model's resulting consistency of sensitivity. In particular, the stochastic model still retains the forward sensitivity of the deterministic model and hence respects important structural/physical constraints, yet has a broader range of parameters capable of producing outcomes consistent with the field data used in evaluating the model. This leads to an expanded range of model applicability. We show, in the context of data assimilation, the stochastic parametrization of longshore currents achieves good results in capturing the statistics of observation that were not used in tuning the model.},\n\tauthor = {Restrepo, Juan M. and Venkataramani, Shankar},\n\tdate = {2016/12//},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/j.advwatres.2016.11.002},\n\tisbn = {0309-1708},\n\tjournal = {Advances in Water Resources},\n\tkeywords = {Longshore currents; Stochastic parametrization; Parameter sensitivity; Consistently of model sensitivity; Data assimilation;; pubs},\n\tmonth = {12},\n\tpages = {186--197},\n\ttitle = {Stochastic longshore current dynamics},\n\tty = {JOUR},\n\turl_arxiv = {https://arxiv.org/abs/1612.01046},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S0309170816306157},\n\tvolume = {98},\n\tyear = {2016},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S0309170816306157},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/j.advwatres.2016.11.002}}\n\n
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\n Abstract We develop a stochastic parametrization, based on a `simple' deterministic model for the dynamics of steady longshore currents, that produces ensembles that are statistically consistent with field observations of these currents. Unlike deterministic models, stochastic parameterization incorporates randomness and hence can only match the observations in a statistical sense. Unlike statistical emulators, in which the model is tuned to the statistical structure of the observation, stochastic parametrization are not directly tuned to match the statistics of the observations. Rather, stochastic parameterization combines deterministic, i.e physics based models with stochastic models for the ``missing physics'' to create hybrid models, that are stochastic, but yet can be used for making predictions, especially in the context of data assimilation. We introduce a novel measure of the utility of stochastic models of complex processes, that we call consistency of sensitivity. A model with poor consistency of sensitivity requires a great deal of tuning of parameters and has a very narrow range of realistic parameters leading to outcomes consistent with a reasonable spectrum of physical outcomes. We apply this metric to our stochastic parametrization and show that, the loss of certainty inherent in model due to its stochastic nature is offset by the model's resulting consistency of sensitivity. In particular, the stochastic model still retains the forward sensitivity of the deterministic model and hence respects important structural/physical constraints, yet has a broader range of parameters capable of producing outcomes consistent with the field data used in evaluating the model. This leads to an expanded range of model applicability. We show, in the context of data assimilation, the stochastic parametrization of longshore currents achieves good results in capturing the statistics of observation that were not used in tuning the model.\n
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\n \n\n \n \n \n \n \n \n Isometric immersions, energy minimization and self-similar buckling in non-Euclidean elastic sheets.\n \n \n \n \n\n\n \n Gemmer, John; Sharon, Eran; Shearman, Toby; and Venkataramani, Shankar C.\n\n\n \n\n\n\n Europhys. Lett., 114(2): 24003. 2016.\n \n\n\n\n
\n\n\n\n \n \n \"Isometric arxiv\n  \n \n \n \"Isometric journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{GSSV2016,\n\tabstract = {The edges of torn plastic sheets and growing leaves often display hierarchical buckling\n patterns. We show that this complex morphology i) emerges even in zero strain configurations, and ii) is driven by a competition between the two principal curvatures, rather than between bending  and stretching.   We identify the key role of branch point (or ``monkey saddle'') singularities in generating complex wrinkling patterns in isometric immersions, and show how they arise naturally from minimizing the elastic energy.},\n\tauthor = {{Gemmer, John} and {Sharon, Eran} and {Shearman, Toby} and {Venkataramani, Shankar C.}},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1209/0295-5075/114/24003},\n\tjournal = {Europhys. Lett.},\n\tkeywords = {pubs},\n\tnumber = 2,\n\tpages = {24003},\n\ttitle = {Isometric immersions, energy minimization and self-similar buckling in non-Euclidean elastic sheets},\n\turl_arxiv = {https://arxiv.org/abs/1601.06863},\n\turl_journal = {http://dx.doi.org/10.1209/0295-5075/114/24003},\n\tvolume = 114,\n\tyear = 2016,\n\tBdsk-Url-1 = {http://dx.doi.org/10.1209/0295-5075/114/24003}}\n\n
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\n The edges of torn plastic sheets and growing leaves often display hierarchical buckling patterns. We show that this complex morphology i) emerges even in zero strain configurations, and ii) is driven by a competition between the two principal curvatures, rather than between bending and stretching. We identify the key role of branch point (or ``monkey saddle'') singularities in generating complex wrinkling patterns in isometric immersions, and show how they arise naturally from minimizing the elastic energy.\n
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\n \n\n \n \n \n \n \n \n A scaling limit for the degree distribution in sublinear preferential attachment schemes.\n \n \n \n \n\n\n \n Choi, J.; Sethuraman, S.; and Venkataramani, S. C.\n\n\n \n\n\n\n Random Structures and Algorithms, 48(4): 703-731. 2016.\n \n\n\n\n
\n\n\n\n \n \n \"A arxiv\n  \n \n \n \"A journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{pref-attach,\n\tabstract = {We consider a general class of preferential attachment schemes evolving by a reinforcement rule with respect to certain sublinear weights. In these schemes, which grow a random network, the sequence of degree distributions is an object of interest which sheds light on the evolving structures. In this article, we use a fluid limit approach to prove a functional law of large numbers for the degree structure in this class, starting from a variety of initial conditions. The method appears robust and applies in particular to `non-tree' evolutions where cycles may develop in the network. A main part of the argument is to analyze an infinite system of coupled ODEs, corresponding to a rate formulation of the law of large numbers limit, in terms of $C_0$-semigroup/dynamical systems methods. These results also resolve a question in Chung, Handjani and Jungreis (2003). },\n\tauthor = {Choi, Jihyeok and Sethuraman, Sunder and Venkataramani, Shankar C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1002/rsa.20615},\n\tissn = {1098-2418},\n\tjournal = {Random Structures and Algorithms},\n\tkeywords = {pubs},\n\tnumber = {4},\n\tpages = {703-731},\n\ttitle = {A scaling limit for the degree distribution in sublinear preferential attachment schemes},\n\turl_arxiv = {http://arxiv.org/abs/1402.4088},\n\turl_journal = {http://onlinelibrary.wiley.com/doi/10.1002/rsa.20615/full},\n\tvolume = {48},\n\tyear = {2016},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1002/rsa.20615}}\n\n
\n
\n\n\n
\n We consider a general class of preferential attachment schemes evolving by a reinforcement rule with respect to certain sublinear weights. In these schemes, which grow a random network, the sequence of degree distributions is an object of interest which sheds light on the evolving structures. In this article, we use a fluid limit approach to prove a functional law of large numbers for the degree structure in this class, starting from a variety of initial conditions. The method appears robust and applies in particular to `non-tree' evolutions where cycles may develop in the network. A main part of the argument is to analyze an infinite system of coupled ODEs, corresponding to a rate formulation of the law of large numbers limit, in terms of $C_0$-semigroup/dynamical systems methods. These results also resolve a question in Chung, Handjani and Jungreis (2003). \n
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\n  \n 2015\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n \n An Oil Fate Model for Shallow-Waters.\n \n \n \n \n\n\n \n Restrepo, J. M.; Ramírez, J. M.; and Venkataramani, S.\n\n\n \n\n\n\n Journal of Marine Science and Engineering, 3(4): 1504. 2015.\n \n\n\n\n
\n\n\n\n \n \n \"An journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@article{jmse3041504,\n\tabstract = {We introduce a model for the dynamics of oil in suspension, appropriate for shallow waters, including the nearshore environment. This model is capable of oil mass conservation and does so by evolving the oil on the sea surface as well as the oil in the subsurface. The shallower portion of the continental shelf poses compounding unique modeling challenges. Many of these relate to the complex nature of advection and dispersion of oil in an environment in which wind, waves, as well as currents all play a role, as does the complex bathymetry and the nearshore geography. In this study we present an overview of the model as well as derive the most fundamental of processes, namely, the shallow water advectiion and dispersion processes. With regard to this basic transport, we superate several fundamental challenges associated with creating a transport model for oil and other buoyant pollutants, capable of capturing the dynamics at the large spatio-temporal scales demanded by environmental and hazard mitigation studies. Some of the strategies are related to dimension reduction and upscaling, and leave discussion of these to companion papers. Here we focus on wave-filtering, ensemble and depth-averaging. Integral to the model is the proposal of an ocean dynamics model that is consistent with the transport. This ocean dynamics model is detailed here. The ocean/oil transport model is applied to a couple of physically-inspired oil-spill problems in demonstrate its specialized capabilities.},\n\tauthor = {Restrepo, Juan M. and Ram\\'{i}rez, Jorge M. and Venkataramani, Shankar},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.3390/jmse3041504},\n\tissn = {2077-1312},\n\tjournal = {Journal of Marine Science and Engineering},\n\tkeywords = {pubs},\n\tnumber = {4},\n\tpages = {1504},\n\ttitle = {An Oil Fate Model for Shallow-Waters},\n\turl_journal = {http://www.mdpi.com/2077-1312/3/4/1504},\n\tvolume = {3},\n\tyear = {2015},\n\tBdsk-Url-1 = {http://www.mdpi.com/2077-1312/3/4/1504},\n\tBdsk-Url-2 = {http://dx.doi.org/10.3390/jmse3041504}}\n\n
\n
\n\n\n
\n We introduce a model for the dynamics of oil in suspension, appropriate for shallow waters, including the nearshore environment. This model is capable of oil mass conservation and does so by evolving the oil on the sea surface as well as the oil in the subsurface. The shallower portion of the continental shelf poses compounding unique modeling challenges. Many of these relate to the complex nature of advection and dispersion of oil in an environment in which wind, waves, as well as currents all play a role, as does the complex bathymetry and the nearshore geography. In this study we present an overview of the model as well as derive the most fundamental of processes, namely, the shallow water advectiion and dispersion processes. With regard to this basic transport, we superate several fundamental challenges associated with creating a transport model for oil and other buoyant pollutants, capable of capturing the dynamics at the large spatio-temporal scales demanded by environmental and hazard mitigation studies. Some of the strategies are related to dimension reduction and upscaling, and leave discussion of these to companion papers. Here we focus on wave-filtering, ensemble and depth-averaging. Integral to the model is the proposal of an ocean dynamics model that is consistent with the transport. This ocean dynamics model is detailed here. The ocean/oil transport model is applied to a couple of physically-inspired oil-spill problems in demonstrate its specialized capabilities.\n
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\n  \n 2014\n \n \n (5)\n \n \n
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\n \n\n \n \n \n \n \n \n Nearshore sticky waters.\n \n \n \n \n\n\n \n Restrepo, J. M.; Venkataramani, S. C.; and Dawson, C.\n\n\n \n\n\n\n Ocean Modelling, 80(0): 49 - 58. 2014.\n \n\n\n\n
\n\n\n\n \n \n \"Nearshore arxiv\n  \n \n \n \"Nearshore journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{sticky_waters,\n\tabstract = {Wind- and current-driven flotsam, oil spills, pollutants, and nutrients, approaching the nearshore will frequently appear to park just beyond the break zone, where waves break. Moreover, the portion of these tracers that beach will do so only after a long time. Explaining why these tracers park and at what rate they reach the shore has important implications on a variety of different nearshore environmental issues, including the determination of what subscale processes are essential in computer models for the simulation of pollutant transport in the nearshore. Using a simple model we provide an explanation for the underlying mechanism responsible for the parking of tracers, the role played by the bottom topography, and the non-uniform dispersion which leads, in some circumstances, to the eventual landing of all or a portion of the tracers. We refer to the parking phenomenon in this environment as nearshore sticky waters. },\n\tauthor = {Juan M. Restrepo and Shankar C. Venkataramani and Clint Dawson},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/j.ocemod.2014.06.003},\n\tissn = {1463-5003},\n\tjournal = {Ocean Modelling},\n\tkeywords = {Waves and currents; pubs},\n\tnumber = {0},\n\tpages = {49 - 58},\n\ttitle = {Nearshore sticky waters},\n\turl_arxiv = {http://arxiv.org/abs/1307.0588},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S1463500314000778},\n\tvolume = {80},\n\tyear = {2014},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S1463500314000778},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/j.ocemod.2014.06.003}}\n\n
\n
\n\n\n
\n Wind- and current-driven flotsam, oil spills, pollutants, and nutrients, approaching the nearshore will frequently appear to park just beyond the break zone, where waves break. Moreover, the portion of these tracers that beach will do so only after a long time. Explaining why these tracers park and at what rate they reach the shore has important implications on a variety of different nearshore environmental issues, including the determination of what subscale processes are essential in computer models for the simulation of pollutant transport in the nearshore. Using a simple model we provide an explanation for the underlying mechanism responsible for the parking of tracers, the role played by the bottom topography, and the non-uniform dispersion which leads, in some circumstances, to the eventual landing of all or a portion of the tracers. We refer to the parking phenomenon in this environment as nearshore sticky waters. \n
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\n \n\n \n \n \n \n \n \n Optical beam shaping and diffraction free waves: A variational approach.\n \n \n \n \n\n\n \n Gemmer, J. A.; Venkataramani, S. C.; Durfee, C. G.; and Moloney, J. V.\n\n\n \n\n\n\n Physica D: Nonlinear Phenomena, 283(0): 15 - 28. 2014.\n \n\n\n\n
\n\n\n\n \n \n \"Optical arxiv\n  \n \n \n \"Optical journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{GVDM2014,\n\tabstract = {We investigate the problem of shaping radially symmetric annular beams into desired intensity patterns along the optical axis. Within the Fresnel approximation, we show that this problem can be expressed in a variational form equivalent to the one arising in phase retrieval. Using the uncertainty principle we prove various rigorous lower bounds on the functional; these lower bounds estimate the $L^2$ error for the beam shaping problem in terms of the design parameters. We also use the method of stationary phase to construct a natural ansatz for a minimizer in the short wavelength limit. We illustrate the implications of our results by applying the method of stationary phase coupled with the Gerchberg--Saxton algorithm to beam shaping problems arising in the remote delivery of beams and pulses.},\n\tauthor = {John A. Gemmer and Shankar C. Venkataramani and Charles G. Durfee and Jerome V. Moloney},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/j.physd.2014.06.003},\n\tissn = {0167-2789},\n\tjournal = {Physica D: Nonlinear Phenomena},\n\tkeywords = {Fresnel approximation; pubs},\n\tnumber = {0},\n\tpages = {15 - 28},\n\ttitle = {Optical beam shaping and diffraction free waves: A variational approach},\n\turl_arxiv = {http://arxiv.org/abs/1307.6289},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S0167278914001195},\n\tvolume = {283},\n\tyear = {2014},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S0167278914001195},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/j.physd.2014.06.003}}\n\n
\n
\n\n\n
\n We investigate the problem of shaping radially symmetric annular beams into desired intensity patterns along the optical axis. Within the Fresnel approximation, we show that this problem can be expressed in a variational form equivalent to the one arising in phase retrieval. Using the uncertainty principle we prove various rigorous lower bounds on the functional; these lower bounds estimate the $L^2$ error for the beam shaping problem in terms of the design parameters. We also use the method of stationary phase to construct a natural ansatz for a minimizer in the short wavelength limit. We illustrate the implications of our results by applying the method of stationary phase coupled with the Gerchberg–Saxton algorithm to beam shaping problems arising in the remote delivery of beams and pulses.\n
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\n \n\n \n \n \n \n \n \n Research Overview of the Consortium for Advanced Research on Transport of Hydrocarbon in the Environment (CARTHE).\n \n \n \n \n\n\n \n Özgökmen, T. M.; Beron-Vera, F. J.; Bogucki, D.; Chen, S. S.; Dawson, C.; Dewar, W.; Griffa, A.; Haus, B. K.; Haza, A. C.; Huntley, H.; Iskandarani, M.; Jacobs, G.; Jagers, B.; Kirwan, A. D.; Laxague, N.; Lipphardt, B.; MacMahan, J.; Mariano, A. J.; Olascoaga, J.; Novelli, G.; Poje, A. C.; Reniers, A. J. H. M.; Restrepo, J. M.; Rosenheim, B.; Ryan, E. H.; Smith, C.; Soloviev, A.; Venkataramani, S.; Zha, G.; and Zhu, P.\n\n\n \n\n\n\n International Oil Spill Conference Proceedings, 2014(1): 544–560. 2014/11/08 2014.\n \n\n\n\n
\n\n\n\n \n \n \"Research journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@article{CARTHE2014,\n\tabstract = {ABSTRACT CARTHE (http://carthe.org/) is a Gulf of Mexico Research Initiative (GoMRI) consortium established through a competitive peer-reviewed selection process. CARTHE comprises 26 principal investigators from 14 universities and research institutions distributed across four Gulf of Mexico states and other four states. It fuses into one group investigators with unique scientific and technical knowledge and extensive publications related to oil fate/transport processes, oceanic and atmospheric turbulence, air-sea interactions, tropical cyclones and winter storms, and coastal and nearshore modeling and observations. Our primary goal is to accurately predict the fate of hydrocarbons released into the environment. Achieving this goal is particularly challenging since petroleum releases into the environment interact with natural processes across six orders of magnitude of time and space scales. We are developing a multi-scale modeling tool by incorporating state-of-the-art hydrophysical models, each applicable for a restricted range of scales, into a single, interconnected modeling system to predict the physical dispersal of hydrocarbons across scales ranging from the microscale at the wellhead to oceanic and atmospheric mesoscales. CARTHE is also conducting novel in-situ observations and laboratory experiments specifically designed for quantifying submesoscale dispersion as well as for both model validation and parameterization. Finally, we are providing a robust set of uncertainty metrics and analysis tools to assess model performance and quantify predictive uncertainty.},\n\tannote = {doi: 10.7901/2169-3358-2014.1.544},\n\tauthor = {{\\"O}zg{\\"o}kmen, Tamay M. and Beron-Vera, Francisco J. and Bogucki, Darek and Chen, Shuyi S. and Dawson, Clint and Dewar, William and Griffa, Annalisa and Haus, Brian K. and Haza, Angelique C. and Huntley, Helga and Iskandarani, Mohamed and Jacobs, Gregg and Jagers, Bert and Kirwan, A. D. and Laxague, Nathan and Lipphardt, Bruce and MacMahan, Jamie and Mariano, Arthur J. and Olascoaga, Josefina and Novelli, Guillaume and Poje, Andrew C. and Reniers, A. J. H. M. and Restrepo, Juan M. and Rosenheim, Brad and Ryan, Edward H. and Smith, Conor and Soloviev, Alexander and Venkataramani, Shankar and Zha, Ge-Cheng and Zhu, Ping},\n\tbooktitle = {International Oil Spill Conference Proceedings},\n\tda = {2014/05/01},\n\tdate = {2014/05/01},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.7901/2169-3358-2014.1.544},\n\tisbn = {2169-3366},\n\tjournal = {International Oil Spill Conference Proceedings},\n\tjournal1 = {International Oil Spill Conference Proceedings},\n\tkeywords = {pubs},\n\tm3 = {doi: 10.7901/2169-3358-2014.1.544},\n\tmonth = {2014/11/08},\n\tn2 = {ABSTRACT CARTHE (http://carthe.org/) is a Gulf of Mexico Research Initiative (GoMRI) consortium established through a competitive peer-reviewed selection process. CARTHE comprises 26 principal investigators from 14 universities and research institutions distributed across four Gulf of Mexico states and other four states. It fuses into one group investigators with unique scientific and technical knowledge and extensive publications related to oil fate/transport processes, oceanic and atmospheric turbulence, air-sea interactions, tropical cyclones and winter storms, and coastal and nearshore modeling and observations. Our primary goal is to accurately predict the fate of hydrocarbons released into the environment. Achieving this goal is particularly challenging since petroleum releases into the environment interact with natural processes across six orders of magnitude of time and space scales. We are developing a multi-scale modeling tool by incorporating state-of-the-art hydrophysical models, each applicable for a restricted range of scales, into a single, interconnected modeling system to predict the physical dispersal of hydrocarbons across scales ranging from the microscale at the wellhead to oceanic and atmospheric mesoscales. CARTHE is also conducting novel in-situ observations and laboratory experiments specifically designed for quantifying submesoscale dispersion as well as for both model validation and parameterization. Finally, we are providing a robust set of uncertainty metrics and analysis tools to assess model performance and quantify predictive uncertainty.},\n\tnumber = {1},\n\tpages = {544--560},\n\tpublisher = {American Petroleum Institute},\n\ttitle = {Research Overview of the Consortium for Advanced Research on Transport of Hydrocarbon in the Environment (CARTHE)},\n\tty = {JOUR},\n\turl_journal = {http://dx.doi.org/10.7901/2169-3358-2014.1.544},\n\tvolume = {2014},\n\tyear = {2014},\n\tyear1 = {2014},\n\tBdsk-Url-1 = {http://dx.doi.org/10.7901/2169-3358-2014.1.544}}\n\n
\n
\n\n\n
\n ABSTRACT CARTHE (http://carthe.org/) is a Gulf of Mexico Research Initiative (GoMRI) consortium established through a competitive peer-reviewed selection process. CARTHE comprises 26 principal investigators from 14 universities and research institutions distributed across four Gulf of Mexico states and other four states. It fuses into one group investigators with unique scientific and technical knowledge and extensive publications related to oil fate/transport processes, oceanic and atmospheric turbulence, air-sea interactions, tropical cyclones and winter storms, and coastal and nearshore modeling and observations. Our primary goal is to accurately predict the fate of hydrocarbons released into the environment. Achieving this goal is particularly challenging since petroleum releases into the environment interact with natural processes across six orders of magnitude of time and space scales. We are developing a multi-scale modeling tool by incorporating state-of-the-art hydrophysical models, each applicable for a restricted range of scales, into a single, interconnected modeling system to predict the physical dispersal of hydrocarbons across scales ranging from the microscale at the wellhead to oceanic and atmospheric mesoscales. CARTHE is also conducting novel in-situ observations and laboratory experiments specifically designed for quantifying submesoscale dispersion as well as for both model validation and parameterization. Finally, we are providing a robust set of uncertainty metrics and analysis tools to assess model performance and quantify predictive uncertainty.\n
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\n \n\n \n \n \n \n \n \n Sharp interfaces in two-dimensional free boundary problems: Interface calculation via matched conformal maps.\n \n \n \n \n\n\n \n Kent, S.; and Venkataramani, S. C.\n\n\n \n\n\n\n Phys. Rev. E, 90: 012407. Jul 2014.\n \n\n\n\n
\n\n\n\n \n \n \"Sharp arxiv\n  \n \n \n \"Sharp journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PRE_interface,\n\tabstract = {We use conformal maps to study a free boundary problem for a two-fluid electromechanical system, where the interface between the fluids is determined by the combined effects of electrostatic forces, gravity, and surface tension. The free boundary in our system develops sharp corners or singularities in certain parameter regimes, and this is an impediment to using existing ``single-scale'' numerical conformal mapping methods. The difficulty is due to the phenomenon of crowding, i.e., the tendency of nodes in the preimage plane to concentrate near the sharp regions of the boundary, leaving the smooth regions of the boundary poorly resolved. A natural idea is to exploit the scale separation between the sharp regions and smooth regions to solve for each region separately and then stitch the solutions together. However, this is not straightforward as conformal maps are rigid ``global'' objects, and it is not obvious how one would patch two conformal maps together to obtain a new conformal map. We develop a ``multiscale'' (i.e., adaptive) conformal mapping method that allows us to carry out this program of stitching conformal maps on different scales together. We successfully apply our method to the electromechanical model problem.},\n\tauthor = {Kent, Stuart and Venkataramani, Shankar C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevE.90.012407},\n\tissue = {1},\n\tjournal = {Phys. Rev. E},\n\tkeywords = {pubs},\n\tmonth = {Jul},\n\tnumpages = {15},\n\tpages = {012407},\n\tpublisher = {American Physical Society},\n\ttitle = {Sharp interfaces in two-dimensional free boundary problems: Interface calculation via matched conformal maps},\n\turl_arxiv = {http://arxiv.org/abs/1405.6965},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevE.90.012407},\n\tvolume = {90},\n\tyear = {2014},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevE.90.012407},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevE.90.012407}}\n\n
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\n We use conformal maps to study a free boundary problem for a two-fluid electromechanical system, where the interface between the fluids is determined by the combined effects of electrostatic forces, gravity, and surface tension. The free boundary in our system develops sharp corners or singularities in certain parameter regimes, and this is an impediment to using existing ``single-scale'' numerical conformal mapping methods. The difficulty is due to the phenomenon of crowding, i.e., the tendency of nodes in the preimage plane to concentrate near the sharp regions of the boundary, leaving the smooth regions of the boundary poorly resolved. A natural idea is to exploit the scale separation between the sharp regions and smooth regions to solve for each region separately and then stitch the solutions together. However, this is not straightforward as conformal maps are rigid ``global'' objects, and it is not obvious how one would patch two conformal maps together to obtain a new conformal map. We develop a ``multiscale'' (i.e., adaptive) conformal mapping method that allows us to carry out this program of stitching conformal maps on different scales together. We successfully apply our method to the electromechanical model problem.\n
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\n \n\n \n \n \n \n \n \n Defining a trend for time series using the intrinsic time-scale decomposition.\n \n \n \n \n\n\n \n Restrepo, J. M; Venkataramani, S.; Comeau, D.; and Flaschka, H.\n\n\n \n\n\n\n New Journal of Physics, 16(8): 085004. 2014.\n \n\n\n\n
\n\n\n\n \n \n \"Defining arxiv\n  \n \n \n \"Defining journal\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{itd_paper,\n\tabstract = {We propose criteria that define a trend for time series with inherent multi-scale features. We call this trend the tendency of a time series. The tendency is defined empirically by a set of criteria and captures the large-scale temporal variability of the original signal as well as the most frequent events in its histogram. Among other properties, the tendency has a variance no larger than that of the original signal; the histogram of the difference between the original signal and the tendency is as symmetric as possible; and with reduced complexity, the tendency captures essential features of the signal. To find the tendency we first use the intrinsic time-scale decomposition (ITD) of the signal, introduced in 2007 by Frei and Osorio, to produce a set of candidate tendencies. We then apply the criteria to each of the candidates to single out the one that best agrees with them. While the criteria for the tendency are independent of the signal decomposition scheme, it is found that the ITD is a simple and stable methodology, well suited for multi-scale signals. The ITD is a relatively new decomposition and little is known about its outcomes. In this study we take the first steps towards a probabilistic model of the ITD analysis of random time series. This analysis yields details concerning the universality and scaling properties of the components of the decomposition.},\n\tauthor = {Juan M Restrepo and Shankar Venkataramani and Darin Comeau and Hermann Flaschka},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tjournal = {New Journal of Physics},\n\tkeywords = {pubs},\n\tnumber = {8},\n\tpages = {085004},\n\ttitle = {Defining a trend for time series using the intrinsic time-scale decomposition},\n\turl_arxiv = {http://arxiv.org/abs/1404.3827},\n\turl_journal = {http://stacks.iop.org/1367-2630/16/i=8/a=085004},\n\tvolume = {16},\n\tyear = {2014},\n\tBdsk-Url-1 = {http://stacks.iop.org/1367-2630/16/i=8/a=085004}}\n\n
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\n\n\n
\n We propose criteria that define a trend for time series with inherent multi-scale features. We call this trend the tendency of a time series. The tendency is defined empirically by a set of criteria and captures the large-scale temporal variability of the original signal as well as the most frequent events in its histogram. Among other properties, the tendency has a variance no larger than that of the original signal; the histogram of the difference between the original signal and the tendency is as symmetric as possible; and with reduced complexity, the tendency captures essential features of the signal. To find the tendency we first use the intrinsic time-scale decomposition (ITD) of the signal, introduced in 2007 by Frei and Osorio, to produce a set of candidate tendencies. We then apply the criteria to each of the candidates to single out the one that best agrees with them. While the criteria for the tendency are independent of the signal decomposition scheme, it is found that the ITD is a simple and stable methodology, well suited for multi-scale signals. The ITD is a relatively new decomposition and little is known about its outcomes. In this study we take the first steps towards a probabilistic model of the ITD analysis of random time series. This analysis yields details concerning the universality and scaling properties of the components of the decomposition.\n
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\n  \n 2013\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Shape transitions in hyperbolic non-Euclidean plates.\n \n \n \n \n\n\n \n Gemmer, J. A.; and Venkataramani, S. C.\n\n\n \n\n\n\n Soft Matter, 9(34): 8151–8161. 2013.\n \n\n\n\n
\n\n\n\n \n \n \"Shape arxiv\n  \n \n \n \"Shape journal\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{GV2013,\n\tabstract = {A non-Euclidean plate is a thin elastic object whose intrinsic geometry is not flat and hence has residual stresses arising from being embedded in three dimensional space. Recently, there has been interest in using localized swelling to induce residual stresses that shape flat objects into desired three dimensional structures. A fundamental question is whether we can use the mathematical theory of non-Euclidean plates to deduce the three dimensional configuration of the swelling sheet given the exact knowledge of the imposed geometry. We present and summarize the results of recent mathematical studies on non-Euclidean plates with imposed constant negative Gaussian curvature in both annular and disc geometries. We show in the F{\\"o}ppl--von K{\\'a}rm{\\'a}n approximation to the elastic energy there are only two types of global minimizers -- flat and saddle shaped deformations -- with localized regions of stretching near the boundary of the domain. We also show that there exist n-wave local minimizers that closely resemble experimental observations and have additional regions of stretching near lines of inflection. Furthermore, in the Kirchhoff approximation to the elastic energy, we show that there exists exact isometric immersions with periodic profiles. The number of waves in these configurations is set by the condition that the bending energy remains finite and grows approximately exponentially with the radius of the annulus. For large radii, these shape are energetically favorable over saddle shapes and could explain why wavy shapes are selected in crochet models of the hyperbolic plane. The predicted morphologies however differ from what is observed in experiments on hydrogel disks highlighting the need for further theoretical studies.},\n\tauthor = {Gemmer, John A. and Venkataramani, Shankar C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tjournal = {Soft Matter},\n\tkeywords = {pubs},\n\tnumber = {34},\n\tpages = {8151--8161},\n\tpublisher = {Royal Society of Chemistry},\n\ttitle = {Shape transitions in hyperbolic non-Euclidean plates},\n\turl_arxiv = {http://arxiv.org/abs/1209.0031},\n\turl_journal = {http://pubs.rsc.org/en/Content/ArticleLanding/2013/SM/c3sm50479d#!divAbstract},\n\tvolume = {9},\n\tyear = {2013},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1039/C3SM50479D}}\n\n
\n
\n\n\n
\n A non-Euclidean plate is a thin elastic object whose intrinsic geometry is not flat and hence has residual stresses arising from being embedded in three dimensional space. Recently, there has been interest in using localized swelling to induce residual stresses that shape flat objects into desired three dimensional structures. A fundamental question is whether we can use the mathematical theory of non-Euclidean plates to deduce the three dimensional configuration of the swelling sheet given the exact knowledge of the imposed geometry. We present and summarize the results of recent mathematical studies on non-Euclidean plates with imposed constant negative Gaussian curvature in both annular and disc geometries. We show in the Föppl–von Kármán approximation to the elastic energy there are only two types of global minimizers – flat and saddle shaped deformations – with localized regions of stretching near the boundary of the domain. We also show that there exist n-wave local minimizers that closely resemble experimental observations and have additional regions of stretching near lines of inflection. Furthermore, in the Kirchhoff approximation to the elastic energy, we show that there exists exact isometric immersions with periodic profiles. The number of waves in these configurations is set by the condition that the bending energy remains finite and grows approximately exponentially with the radius of the annulus. For large radii, these shape are energetically favorable over saddle shapes and could explain why wavy shapes are selected in crochet models of the hyperbolic plane. The predicted morphologies however differ from what is observed in experiments on hydrogel disks highlighting the need for further theoretical studies.\n
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\n \n\n \n \n \n \n \n \n Asymptotic analysis of weakly nonlinear Bessel-Gauß beams.\n \n \n \n \n\n\n \n Graf, T.; Moloney, J.; and Venkataramani, S.\n\n\n \n\n\n\n Physica D: Nonlinear Phenomena, 243(1): 32 - 44. 2013.\n \n\n\n\n
\n\n\n\n \n \n \"Asymptotic journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{GMV2013,\n\tabstract = {In this paper we investigate the propagation of conical waves in nonlinear media. In particular, we are interested in the effects resulting from applying a Gaussian apodization to an ideal nondiffracting wave. First, we present a multiple scales approach to derive amplitude equations for weakly nonlinear conical waves from a governing equation of cubic nonlinear Schr{\\"o}dinger type. From these equations we obtain asymptotic solutions for the linear and the weakly nonlinear problem for which we state several uniform estimates that describe the deviation from the ideal nondiffracting solution. Moreover, we show numerical simulations based on an implementation of our amplitude equations to support and illustrate our analytical results.},\n\tauthor = {Tobias Graf and Jerome Moloney and Shankar Venkataramani},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/j.physd.2012.09.004},\n\tissn = {0167-2789},\n\tjournal = {Physica D: Nonlinear Phenomena},\n\tkeywords = {Uniform estimates; pubs},\n\tnumber = {1},\n\tpages = {32 - 44},\n\ttitle = {Asymptotic analysis of weakly nonlinear {Bessel}-{Gau}\\ss { } beams},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S0167278912002308},\n\tvolume = {243},\n\tyear = {2013},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S0167278912002308},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/j.physd.2012.09.004}}\n\n
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\n In this paper we investigate the propagation of conical waves in nonlinear media. In particular, we are interested in the effects resulting from applying a Gaussian apodization to an ideal nondiffracting wave. First, we present a multiple scales approach to derive amplitude equations for weakly nonlinear conical waves from a governing equation of cubic nonlinear Schrödinger type. From these equations we obtain asymptotic solutions for the linear and the weakly nonlinear problem for which we state several uniform estimates that describe the deviation from the ideal nondiffracting solution. Moreover, we show numerical simulations based on an implementation of our amplitude equations to support and illustrate our analytical results.\n
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\n  \n 2012\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Propagation of Gaussian-apodized paraxial beams through first-order optical systems via complex coordinate transforms and ray transfer matrices.\n \n \n \n \n\n\n \n Graf, T.; Christodoulides, D. N.; Mills, M. S.; Moloney, J. V.; Venkataramani, S. C.; and Wright, E. M.\n\n\n \n\n\n\n J. Opt. Soc. Am. A, 29(9): 1860–1869. Sep 2012.\n \n\n\n\n
\n\n\n\n \n \n \"Propagation journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Graf2012,\n\tabstract = {We investigate the linear propagation of Gaussian-apodized solutions to the paraxial wave equation in free-space and first-order optical systems. In particular, we present complex coordinate transformations that yield a very general and efficient method to apply a Gaussian apodization (possibly with initial phase curvature) to a solution of the paraxial wave equation. Moreover, we show how this method can be extended from free space to describe propagation behavior through nonimaging first-order optical systems by combining our coordinate transform approach with ray transfer matrix methods. Our framework includes several classes of interesting beams that are important in applications as special cases. Among these are, for example, the Bessel\\&\\#x2013;Gauss and the Airy\\&\\#x2013;Gauss beams, which are of strong interest to researchers and practitioners in various fields.},\n\tauthor = {T. Graf and D. N. Christodoulides and M. S. Mills and J. V. Moloney and S. C. Venkataramani and E. M. Wright},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1364/JOSAA.29.001860},\n\tjournal = {J. Opt. Soc. Am. A},\n\tkeywords = {Mathematical methods in physics; Matrix methods in paraxial optics; Lasers and laser optics; Diffraction theory; Dispersion; Nonimaging optical systems; pubs},\n\tmonth = {Sep},\n\tnumber = {9},\n\tpages = {1860--1869},\n\tpublisher = {OSA},\n\ttitle = {Propagation of Gaussian-apodized paraxial beams through first-order optical systems via complex coordinate transforms and ray transfer matrices},\n\turl_journal = {http://josaa.osa.org/abstract.cfm?URI=josaa-29-9-1860},\n\tvolume = {29},\n\tyear = {2012},\n\tBdsk-Url-1 = {http://josaa.osa.org/abstract.cfm?URI=josaa-29-9-1860},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1364/JOSAA.29.001860}}\n\n
\n
\n\n\n
\n We investigate the linear propagation of Gaussian-apodized solutions to the paraxial wave equation in free-space and first-order optical systems. In particular, we present complex coordinate transformations that yield a very general and efficient method to apply a Gaussian apodization (possibly with initial phase curvature) to a solution of the paraxial wave equation. Moreover, we show how this method can be extended from free space to describe propagation behavior through nonimaging first-order optical systems by combining our coordinate transform approach with ray transfer matrix methods. Our framework includes several classes of interesting beams that are important in applications as special cases. Among these are, for example, the Bessel–Gauss and the Airy–Gauss beams, which are of strong interest to researchers and practitioners in various fields.\n
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\n \n\n \n \n \n \n \n \n Defects and boundary layers in non-Euclidean plates.\n \n \n \n \n\n\n \n Gemmer, J. A.; and Venkataramani, S. C.\n\n\n \n\n\n\n Nonlinearity, 25(12): 3553–3581. 2012.\n \n\n\n\n
\n\n\n\n \n \n \"Defects arxiv\n  \n \n \n \"Defects journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{GV2012,\n\tabstract = {We investigate the behaviour of non-Euclidean plates with constant negative Gaussian curvature using the F{\\"o}ppl--von K{\\'a}rm{\\'a}n reduced theory of elasticity. Motivated by recent experimental results, we focus on annuli with a periodic profile. We prove rigorous upper and lower bounds for the elastic energy that scales like the thickness squared. In particular we show that are only two types of global minimizers---deformations that remain flat and saddle shaped deformations with isolated regions of stretching near the edge of the annulus. We also show that there exist local minimizers with a periodic profile that have additional boundary layers near their lines of inflection. These additional boundary layers are a new phenomenon in thin elastic sheets and are necessary to regularize jump discontinuities in the azimuthal curvature across lines of inflection. We rigorously derive scaling laws for the width of these boundary layers as a function of the thickness of the sheet.},\n\tauthor = {Gemmer, John A. and Venkataramani, Shankar C.},\n\tcoden = {NONLE5},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1088/0951-7715/25/12/3553},\n\tfjournal = {Nonlinearity},\n\tissn = {0951-7715},\n\tjournal = {Nonlinearity},\n\tkeywords = {pubs},\n\tmrclass = {74K20 (35Q74)},\n\tmrnumber = {2997707},\n\tnumber = {12},\n\tpages = {3553--3581},\n\ttitle = {Defects and boundary layers in non-{E}uclidean plates},\n\turl_arxiv = {http://arxiv.org/abs/1203.4329},\n\turl_journal = {http://dx.doi.org/10.1088/0951-7715/25/12/3553},\n\tvolume = {25},\n\tyear = {2012},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1088/0951-7715/25/12/3553},\n\tBdsk-Url-2 = {http://stacks.iop.org/0951-7715/25/i=12/a=3553}}\n\n
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\n\n\n
\n We investigate the behaviour of non-Euclidean plates with constant negative Gaussian curvature using the Föppl–von Kármán reduced theory of elasticity. Motivated by recent experimental results, we focus on annuli with a periodic profile. We prove rigorous upper and lower bounds for the elastic energy that scales like the thickness squared. In particular we show that are only two types of global minimizers—deformations that remain flat and saddle shaped deformations with isolated regions of stretching near the edge of the annulus. We also show that there exist local minimizers with a periodic profile that have additional boundary layers near their lines of inflection. These additional boundary layers are a new phenomenon in thin elastic sheets and are necessary to regularize jump discontinuities in the azimuthal curvature across lines of inflection. We rigorously derive scaling laws for the width of these boundary layers as a function of the thickness of the sheet.\n
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\n  \n 2011\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Experimental Study of Shape Transitions and Energy Scaling in Thin Non-Euclidean Plates.\n \n \n \n \n\n\n \n Klein, Y.; Venkataramani, S.; and Sharon, E.\n\n\n \n\n\n\n Phys. Rev. Lett., 106: 118303. Mar 2011.\n \n\n\n\n
\n\n\n\n \n \n \"Experimental journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{KVS2011,\n\tabstract = {\nWe present the first quantitative measurements of shape and energy variation in non-Euclidean plates. Using environmentally responsive gel, we construct non-Euclidean disks of constant imposed Gaussian curvature, $K_{tar}$. We vary the disks' thickness $t_0$ and measure the dependence of configurations, surface curvature, and energy content on $t_0$. For $K_{tar} < 0$, configurations are of a single wavy mode and undergo a set of bifurcations that leads to their refinement with decreasing thickness. This leads to sharp increase in the amount of surface bending as $t_0 \\to 0$, and to a slow decay of both bending and stretching energies. Both vary like $t_0^2$, compared with $t_0^3$ of the bending energy in disks with $K_{tar} > 0$.},\n\tauthor = {Klein, Yael and Venkataramani, Shankar and Sharon, Eran},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevLett.106.118303},\n\tissue = {11},\n\tjournal = {Phys. Rev. Lett.},\n\tkeywords = {pubs},\n\tmonth = {Mar},\n\tnumpages = {4},\n\tpages = {118303},\n\tpublisher = {American Physical Society},\n\ttitle = {Experimental Study of Shape Transitions and Energy Scaling in Thin Non-Euclidean Plates},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevLett.106.118303},\n\tvolume = {106},\n\tyear = {2011},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevLett.106.118303},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevLett.106.118303}}\n\n
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\n We present the first quantitative measurements of shape and energy variation in non-Euclidean plates. Using environmentally responsive gel, we construct non-Euclidean disks of constant imposed Gaussian curvature, $K_{tar}$. We vary the disks' thickness $t_0$ and measure the dependence of configurations, surface curvature, and energy content on $t_0$. For $K_{tar} < 0$, configurations are of a single wavy mode and undergo a set of bifurcations that leads to their refinement with decreasing thickness. This leads to sharp increase in the amount of surface bending as $t_0 \\to 0$, and to a slow decay of both bending and stretching energies. Both vary like $t_0^2$, compared with $t_0^3$ of the bending energy in disks with $K_{tar} > 0$.\n
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\n \n\n \n \n \n \n \n \n Shape selection in non-Euclidean plates.\n \n \n \n \n\n\n \n Gemmer, J. A.; and Venkataramani, S. C.\n\n\n \n\n\n\n Physica D: Nonlinear Phenomena, 240(19): 1536 - 1552. 2011.\n \n\n\n\n
\n\n\n\n \n \n \"Shape arxiv\n  \n \n \n \"Shape journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{GV2011,\n\tabstract = {We investigate isometric immersions of disks with constant negative curvature into $R^3$, and the minimizers for the bending energy, i.e.   the $L^2$ norm of the principal curvatures over the class of $W^{2,2}$ isometric immersions. We show the existence of smooth immersions of arbitrarily large geodesic balls in $H^2$ into $R^3$. In elucidating the connection between these immersions and the non-existence/singularity results of Hilbert and Amsler, we obtain a lower bound for the $L^\\infty$ norm of the principal curvatures for such smooth isometric immersions. We also construct piecewise smooth isometric immersions that have a periodic profile, are globally $W^{2,2}$ and numerically have lower bending energy than their smooth counterparts. The number of periods in these configurations is set by the condition that the principal curvatures of the surface remain finite and grow approximately exponentially with the radius of the disk. We discuss the implications of our results on recent experiments on the mechanics of non-Euclidean plates.\n},\n\tauthor = {Gemmer, John A. and Venkataramani, Shankar C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/j.physd.2011.07.002},\n\tissn = {0167-2789},\n\tjournal = {Physica D: Nonlinear Phenomena},\n\tkeywords = {Morphogenesis in soft tissue; pubs},\n\tnumber = {19},\n\tpages = {1536 - 1552},\n\ttitle = {Shape selection in non-Euclidean plates},\n\turl_arxiv = {http://arxiv.org/abs/1005.4442},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S0167278911001825},\n\tvolume = {240},\n\tyear = {2011},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S0167278911001825},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/j.physd.2011.07.002}}\n\n
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\n We investigate isometric immersions of disks with constant negative curvature into $R^3$, and the minimizers for the bending energy, i.e. the $L^2$ norm of the principal curvatures over the class of $W^{2,2}$ isometric immersions. We show the existence of smooth immersions of arbitrarily large geodesic balls in $H^2$ into $R^3$. In elucidating the connection between these immersions and the non-existence/singularity results of Hilbert and Amsler, we obtain a lower bound for the $L^∞$ norm of the principal curvatures for such smooth isometric immersions. We also construct piecewise smooth isometric immersions that have a periodic profile, are globally $W^{2,2}$ and numerically have lower bending energy than their smooth counterparts. The number of periods in these configurations is set by the condition that the principal curvatures of the surface remain finite and grow approximately exponentially with the radius of the disk. We discuss the implications of our results on recent experiments on the mechanics of non-Euclidean plates. \n
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\n  \n 2009\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n \n A variational theory for point defects in patterns.\n \n \n \n \n\n\n \n Ercolani, N. M.; and Venkataramani, S. C.\n\n\n \n\n\n\n J. Nonlinear Sci., 19(3): 267–300. 2009.\n \n\n\n\n
\n\n\n\n \n \n \"A arxiv\n  \n \n \n \"A journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{patt_defects,\n\tabstract = {\nWe derive a rigorous scaling law for minimizers in a natural version of the regularized Cross--Newell model for pattern formation far from threshold. These energy-minimizing solutions support defects having the same character as what is seen in experimental studies of the corresponding physical systems and in numerical simulations of the microscopic equations that describe these systems.},\n\tauthor = {Ercolani, N. M. and Venkataramani, S. C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1007/s00332-008-9035-9},\n\tfjournal = {Journal of Nonlinear Science},\n\tissn = {0938-8974},\n\tjournal = {J. Nonlinear Sci.},\n\tkeywords = {pubs},\n\tmrclass = {35K25 (35A15 35K58 74R05)},\n\tmrnumber = {2511257 (2010d:35149)},\n\tmrreviewer = {Daniela Giachetti},\n\tnumber = {3},\n\tpages = {267--300},\n\ttitle = {A variational theory for point defects in patterns},\n\turl_arxiv = {http://arxiv.org/abs/0706.2917},\n\turl_journal = {http://dx.doi.org/10.1007/s00332-008-9035-9},\n\tvolume = {19},\n\tyear = {2009},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1007/s00332-008-9035-9}}\n\n
\n
\n\n\n
\n We derive a rigorous scaling law for minimizers in a natural version of the regularized Cross–Newell model for pattern formation far from threshold. These energy-minimizing solutions support defects having the same character as what is seen in experimental studies of the corresponding physical systems and in numerical simulations of the microscopic equations that describe these systems.\n
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\n  \n 2004\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Discrete charges on a two dimensional conductor.\n \n \n \n \n\n\n \n Berkenbusch, M. K.; Claus, I.; Dunn, C.; Kadanoff, L. P.; Nicewicz, M.; and Venkataramani, S. C.\n\n\n \n\n\n\n J. Statist. Phys., 116(5-6): 1301–1358. 2004.\n \n\n\n\n
\n\n\n\n \n \n \"Discrete arxiv\n  \n \n \n \"Discrete journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@article{MR2096037,\n\tabstract = {We investigate the electrostatic equilibria of N discrete charges of size 1/N on a two dimensional conductor (domain). We study the distribution of the charges on symmetric domains including the ellipse, the hypotrochoid and various regular polygons, with an emphasis on understanding the distributions of the charges, as the shape of the underlying conductor becomes singular. We find that there are two regimes of behavior, a symmetric regime for smooth conductors, and a symmetry broken regime for ``singular'' domains. For smooth conductors, the locations of the charges can be determined, to within O(logN/N2{\\^a}€¾{\\^a}€¾{\\^a}€¾{\\^a}€¾{\\^a}€¾{\\^a}€¾{\\^a}€¾{\\^a}€¾{\\^a}€¾{\\^a}ˆ{\\v s}) by an integral equation due to Pommerenke [ Math. Ann., 179: 212--218, (1969)]. We present a derivation of a related (but different) integral equation, which has the same solutions. We also solve the equation to obtain (asymptotic) solutions which show universal behavior in the distribution of the charges in conductors with somewhat smooth cusps. Conductors with sharp cusps and singularities show qualitatively different behavior, where the symmetry of the problem is broken, and the distribution of the discrete charges does not respect the symmetry of the underlying domain. We investigate the symmetry breaking both theoretically, and numerically, and find good agreement between our theory and the numerics. We also find that the universality in the distribution of the charges near the cusps persists in the symmetry broken regime, although this distribution is very different from the one given by the integral equation.},\n\tauthor = {Berkenbusch, Marko K. and Claus, Isabelle and Dunn, Catherine and Kadanoff, Leo P. and Nicewicz, Maciej and Venkataramani, Shankar C.},\n\tcoden = {JSTPSB},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1023/B:JOSS.0000041741.27244.ac},\n\tfjournal = {Journal of Statistical Physics},\n\tissn = {0022-4715},\n\tjournal = {J. Statist. Phys.},\n\tkeywords = {pubs},\n\tmrclass = {78A30 (37J40 37N20 78A35)},\n\tmrnumber = {2096037 (2006d:78009)},\n\tmrreviewer = {T. Erber},\n\tnumber = {5-6},\n\tpages = {1301--1358},\n\ttitle = {Discrete charges on a two dimensional conductor},\n\turl_arxiv = {http://arxiv.org/abs/cond-mat/0310257},\n\turl_journal = {http://dx.doi.org/10.1023/B:JOSS.0000041741.27244.ac},\n\tvolume = {116},\n\tyear = {2004},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1023/B:JOSS.0000041741.27244.ac}}\n\n
\n
\n\n\n
\n We investigate the electrostatic equilibria of N discrete charges of size 1/N on a two dimensional conductor (domain). We study the distribution of the charges on symmetric domains including the ellipse, the hypotrochoid and various regular polygons, with an emphasis on understanding the distributions of the charges, as the shape of the underlying conductor becomes singular. We find that there are two regimes of behavior, a symmetric regime for smooth conductors, and a symmetry broken regime for ``singular'' domains. For smooth conductors, the locations of the charges can be determined, to within O(logN/N2‾‾‾‾‾‾‾‾‾∠̌s) by an integral equation due to Pommerenke [ Math. Ann., 179: 212–218, (1969)]. We present a derivation of a related (but different) integral equation, which has the same solutions. We also solve the equation to obtain (asymptotic) solutions which show universal behavior in the distribution of the charges in conductors with somewhat smooth cusps. Conductors with sharp cusps and singularities show qualitatively different behavior, where the symmetry of the problem is broken, and the distribution of the discrete charges does not respect the symmetry of the underlying domain. We investigate the symmetry breaking both theoretically, and numerically, and find good agreement between our theory and the numerics. We also find that the universality in the distribution of the charges near the cusps persists in the symmetry broken regime, although this distribution is very different from the one given by the integral equation.\n
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\n \n\n \n \n \n \n \n \n Lower bounds for the energy in a crumpled elastic sheet—a minimal ridge.\n \n \n \n \n\n\n \n Venkataramani, S. C.\n\n\n \n\n\n\n Nonlinearity, 17(1): 301–312. 2004.\n \n\n\n\n
\n\n\n\n \n \n \"Lower arxiv\n  \n \n \n \"Lower journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{MR2023444,\n\tabstract = {We study the linearized F{\\"o}ppl--von Karman theory of a long, thin rectangular elastic membrane that is bent through an angle 2 {\\^I}$\\pm$. We prove rigorous bounds for the minimum energy of this configuration in terms of the plate thickness, {\\"I}ƒ, and the bending angle. We show that the minimum energy scales as {\\"I}ƒ5/3 {\\^I}$\\pm$7/3. This scaling is in sharp contrast with previously obtained results for the linearized theory of thin sheets with isotropic compression boundary conditions, where the energy scales as {\\"I}ƒ.},\n\tauthor = {Venkataramani, Shankar C.},\n\tcoden = {NONLE5},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1088/0951-7715/17/1/017},\n\tfjournal = {Nonlinearity},\n\tissn = {0951-7715},\n\tjournal = {Nonlinearity},\n\tkeywords = {pubs},\n\tmrclass = {74K15 (46N10 47J20 49J40 74G65)},\n\tmrnumber = {2023444 (2005b:74077)},\n\tmrreviewer = {Yi-Chung Shu},\n\tnumber = {1},\n\tpages = {301--312},\n\ttitle = {Lower bounds for the energy in a crumpled elastic sheet---a minimal ridge},\n\turl_arxiv = {http://arxiv.org/abs/math/0210012},\n\turl_journal = {http://dx.doi.org/10.1088/0951-7715/17/1/017},\n\tvolume = {17},\n\tyear = {2004},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1088/0951-7715/17/1/017}}\n\n
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\n\n\n
\n We study the linearized Föppl–von Karman theory of a long, thin rectangular elastic membrane that is bent through an angle 2 Î$±$. We prove rigorous bounds for the minimum energy of this configuration in terms of the plate thickness, σ, and the bending angle. We show that the minimum energy scales as σ5/3 Î$±$7/3. This scaling is in sharp contrast with previously obtained results for the linearized theory of thin sheets with isotropic compression boundary conditions, where the energy scales as σ.\n
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\n  \n 2002\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n \n Trapping of vibrational energy in crumpled sheets.\n \n \n \n \n\n\n \n Gopinathan, A.; Witten, T. A.; and Venkataramani, S. C.\n\n\n \n\n\n\n Phys. Rev. E, 65: 036613. Feb 2002.\n \n\n\n\n
\n\n\n\n \n \n \"Trapping journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@article{PhysRevE.65.036613,\n\tauthor = {Gopinathan, Ajay and Witten, T. A. and Venkataramani, S. C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevE.65.036613},\n\tissue = {3},\n\tjournal = {Phys. Rev. E},\n\tkeywords = {pubs},\n\tmonth = {Feb},\n\tnumpages = {11},\n\tpages = {036613},\n\tpublisher = {American Physical Society},\n\ttitle = {Trapping of vibrational energy in crumpled sheets},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevE.65.036613},\n\tvolume = {65},\n\tyear = {2002},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevE.65.036613},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevE.65.036613}}\n\n
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\n  \n 2001\n \n \n (4)\n \n \n
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\n \n\n \n \n \n \n \n \n Continuum Coupled Maps: A model for patterns in vibrated sand.\n \n \n \n \n\n\n \n Ott, E.; and Venkataramani, S. C.\n\n\n \n\n\n\n In Proceedings of the 5th Experimental Chaos Conference, pages 143-153. World Scientific, 2016/11/23 2001.\n \n\n\n\n
\n\n\n\n \n \n \"ContinuumPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@incollection{OTT:2001aa,\n\tannote = {doi:10.1142/9789812811516{\\_}0014},\n\tauthor = {Ott, Edward and Venkataramani, Shankar C.},\n\tbooktitle = {Proceedings of the 5th Experimental Chaos Conference},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2021-05-23 18:55:49 -0700},\n\tdoi = {doi:10.1142/9789812811516{\\_}0014},\n\tisbn = {978-981-02-4561-0},\n\tkeywords = {pubs},\n\tm1 = {0},\n\tm3 = {doi:10.1142/9789812811516{\\_}0014},\n\tmonth = {2016/11/23},\n\tpages = {143-153},\n\tpublisher = {World Scientific},\n\ttitle = {Continuum Coupled Maps: A model for patterns in vibrated sand},\n\tty = {CHAP},\n\turl = {http://dx.doi.org/10.1142/9789812811516_0014},\n\tyear = {2001},\n\tyear1 = {2001/04/01},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1142/9789812811516_0014},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1142/9789812811516%7B%5C_%7D0014}}\n\n
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\n \n\n \n \n \n \n \n \n Front propagation of spatiotemporal chaos.\n \n \n \n \n\n\n \n Kim, J. W.; Vaishnav, J. Y.; Ott, E.; Venkataramani, S. C.; and Losert, W.\n\n\n \n\n\n\n Phys. Rev. E, 64: 016215. Jun 2001.\n \n\n\n\n
\n\n\n\n \n \n \"Front journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevE.64.016215,\n\tauthor = {Kim, J. W. and Vaishnav, J. Y. and Ott, E. and Venkataramani, S. C. and Losert, W.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevE.64.016215},\n\tissue = {1},\n\tjournal = {Phys. Rev. E},\n\tkeywords = {pubs},\n\tmonth = {Jun},\n\tnumpages = {5},\n\tpages = {016215},\n\tpublisher = {American Physical Society},\n\ttitle = {Front propagation of spatiotemporal chaos},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevE.64.016215},\n\tvolume = {64},\n\tyear = {2001},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevE.64.016215},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevE.64.016215}}\n\n
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\n \n\n \n \n \n \n \n \n Singularities, structures, and scaling in deformed m-dimensional elastic manifolds.\n \n \n \n \n\n\n \n DiDonna, B. A.; Witten, T. A.; Venkataramani, S. C.; and Kramer, E. M.\n\n\n \n\n\n\n Phys. Rev. E, 65: 016603. Dec 2001.\n \n\n\n\n
\n\n\n\n \n \n \"Singularities, journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevE.65.016603,\n\tauthor = {DiDonna, B. A. and Witten, T. A. and Venkataramani, S. C. and Kramer, E. M.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevE.65.016603},\n\tissue = {1},\n\tjournal = {Phys. Rev. E},\n\tkeywords = {pubs},\n\tmonth = {Dec},\n\tnumpages = {25},\n\tpages = {016603},\n\tpublisher = {American Physical Society},\n\ttitle = {Singularities, structures, and scaling in deformed m-dimensional elastic manifolds},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevE.65.016603},\n\tvolume = {65},\n\tyear = {2001},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevE.65.016603},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevE.65.016603}}\n\n
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\n \n\n \n \n \n \n \n \n Pattern selection in extended periodically forced systems: A continuum coupled map approach.\n \n \n \n \n\n\n \n Venkataramani, S. C.; and Ott, E.\n\n\n \n\n\n\n Phys. Rev. E, 63: 046202. Mar 2001.\n \n\n\n\n
\n\n\n\n \n \n \"Pattern journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevE.63.046202,\n\tauthor = {Venkataramani, Shankar C. and Ott, Edward},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevE.63.046202},\n\tissue = {4},\n\tjournal = {Phys. Rev. E},\n\tkeywords = {pubs},\n\tmonth = {Mar},\n\tnumpages = {27},\n\tpages = {046202},\n\tpublisher = {American Physical Society},\n\ttitle = {Pattern selection in extended periodically forced systems: A continuum coupled map approach},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevE.63.046202},\n\tvolume = {63},\n\tyear = {2001},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevE.63.046202},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevE.63.046202}}\n\n
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\n  \n 2000\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n \n Limitations on the smooth confinement of an unstretchable manifold.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Witten, T. A.; Kramer, E. M.; and Geroch, R. P.\n\n\n \n\n\n\n J. Math. Phys., 41(7): 5107–5128. 2000.\n \n\n\n\n
\n\n\n\n \n \n \"Limitations journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{MR1765831,\n\tauthor = {Venkataramani, S. C. and Witten, T. A. and Kramer, E. M. and Geroch, R. P.},\n\tcoden = {JMAPAQ},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1063/1.533394},\n\tfjournal = {Journal of Mathematical Physics},\n\tissn = {0022-2488},\n\tjournal = {J. Math. Phys.},\n\tkeywords = {pubs},\n\tmrclass = {53A07 (53C42)},\n\tmrnumber = {1765831 (2001j:53008)},\n\tmrreviewer = {Anders Linn{\\'e}r},\n\tnumber = {7},\n\tpages = {5107--5128},\n\ttitle = {Limitations on the smooth confinement of an unstretchable manifold},\n\turl_journal = {http://dx.doi.org/10.1063/1.533394},\n\tvolume = {41},\n\tyear = {2000},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1063/1.533394}}\n\n
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\n  \n 1999\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Noise stabilization of self-organized memories.\n \n \n \n \n\n\n \n Povinelli, M. L.; Coppersmith, S. N.; Kadanoff, L. P.; Nagel, S. R.; and Venkataramani, S. C.\n\n\n \n\n\n\n Phys. Rev. E, 59: 4970–4982. May 1999.\n \n\n\n\n
\n\n\n\n \n \n \"Noise journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevE.59.4970,\n\tauthor = {Povinelli, M. L. and Coppersmith, S. N. and Kadanoff, L. P. and Nagel, S. R. and Venkataramani, S. C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevE.59.4970},\n\tissue = {5},\n\tjournal = {Phys. Rev. E},\n\tkeywords = {pubs},\n\tmonth = {May},\n\tnumpages = {0},\n\tpages = {4970--4982},\n\tpublisher = {American Physical Society},\n\ttitle = {Noise stabilization of self-organized memories},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevE.59.4970},\n\tvolume = {59},\n\tyear = {1999},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevE.59.4970},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevE.59.4970}}\n\n
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\n \n\n \n \n \n \n \n \n Diffusion, attraction and collapse.\n \n \n \n \n\n\n \n Brenner, M. P.; Constantin, P.; Kadanoff, L. P.; Schenkel, A.; and Venkataramani, S. C.\n\n\n \n\n\n\n Nonlinearity, 12(4): 1071–1098. 1999.\n \n\n\n\n
\n\n\n\n \n \n \"Diffusion, journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{MR1709861,\n\tauthor = {Brenner, Michael P. and Constantin, Peter and Kadanoff, Leo P. and Schenkel, Alain and Venkataramani, Shankar C.},\n\tcoden = {NONLE5},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1088/0951-7715/12/4/320},\n\tfjournal = {Nonlinearity},\n\tissn = {0951-7715},\n\tjournal = {Nonlinearity},\n\tkeywords = {pubs},\n\tmrclass = {76N99 (35K55 92C17)},\n\tmrnumber = {1709861 (2001d:76107)},\n\tnumber = {4},\n\tpages = {1071--1098},\n\ttitle = {Diffusion, attraction and collapse},\n\turl_journal = {http://dx.doi.org/10.1088/0951-7715/12/4/320},\n\tvolume = {12},\n\tyear = {1999},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1088/0951-7715/12/4/320}}\n\n
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\n  \n 1998\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n Cones, creases and crumpled sheets.\n \n \n \n\n\n \n Venkataramani, S.\n\n\n \n\n\n\n 1998.\n \n\n\n\n
\n\n\n\n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@periodical{venkataramani1998cones,\n\tauthor = {Venkataramani, Shankar},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tjournal = {Physics world},\n\tkeywords = {pubs},\n\tnumber = {7},\n\ttitle = {Cones, creases and crumpled sheets},\n\tvolume = {11},\n\tyear = {1998}}\n\n
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\n \n\n \n \n \n \n \n \n Spatiotemporal Bifurcation Phenomena with Temporal Period Doubling: Patterns in Vibrated Sand.\n \n \n \n \n\n\n \n Venkataramani, S. C.; and Ott, E.\n\n\n \n\n\n\n Phys. Rev. Lett., 80: 3495–3498. Apr 1998.\n \n\n\n\n
\n\n\n\n \n \n \"Spatiotemporal journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevLett.80.3495,\n\tauthor = {Venkataramani, Shankar C. and Ott, Edward},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevLett.80.3495},\n\tissue = {16},\n\tjournal = {Phys. Rev. Lett.},\n\tkeywords = {pubs},\n\tmonth = {Apr},\n\tnumpages = {0},\n\tpages = {3495--3498},\n\tpublisher = {American Physical Society},\n\ttitle = {Spatiotemporal Bifurcation Phenomena with Temporal Period Doubling: Patterns in Vibrated Sand},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevLett.80.3495},\n\tvolume = {80},\n\tyear = {1998},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevLett.80.3495},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevLett.80.3495}}\n\n
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\n \n\n \n \n \n \n \n \n Anomalous diffusion in bounded temporally irregular flows.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Antonsen, T. M.; and Ott, E.\n\n\n \n\n\n\n Physica D: Nonlinear Phenomena, 112(3–4): 412 - 440. 1998.\n \n\n\n\n
\n\n\n\n \n \n \"Anomalous journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Venkataramani1998412,\n\tauthor = {Shankar C. Venkataramani and Thomas M. Antonsen and Edward Ott},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/S0167-2789(97)00184-X},\n\tissn = {0167-2789},\n\tjournal = {Physica D: Nonlinear Phenomena},\n\tkeywords = {Hamiltonian systems; pubs},\n\tnumber = {3--4},\n\tpages = {412 - 440},\n\ttitle = {Anomalous diffusion in bounded temporally irregular flows},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/S016727899700184X},\n\tvolume = {112},\n\tyear = {1998},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/S016727899700184X},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/S0167-2789(97)00184-X}}\n\n
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\n  \n 1997\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Self-Organized Short-Term Memories.\n \n \n \n \n\n\n \n Coppersmith, S. N.; Jones, T. C.; Kadanoff, L. P.; Levine, A.; McCarten, J. P.; Nagel, S. R.; Venkataramani, S. C.; and Wu, X.\n\n\n \n\n\n\n Phys. Rev. Lett., 78: 3983–3986. May 1997.\n \n\n\n\n
\n\n\n\n \n \n \"Self-OrganizedPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevLett.78.3983,\n\tauthor = {Coppersmith, S. N. and Jones, T. C. and Kadanoff, L. P. and Levine, A. and McCarten, J. P. and Nagel, S. R. and Venkataramani, S. C. and Wu, Xinlei},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevLett.78.3983},\n\tissue = {21},\n\tjournal = {Phys. Rev. Lett.},\n\tkeywords = {pubs},\n\tmonth = {May},\n\tnumpages = {0},\n\tpages = {3983--3986},\n\tpublisher = {American Physical Society},\n\ttitle = {Self-Organized Short-Term Memories},\n\turl = {http://link.aps.org/doi/10.1103/PhysRevLett.78.3983},\n\tvolume = {78},\n\tyear = {1997},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevLett.78.3983},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevLett.78.3983}}\n\n
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\n \n\n \n \n \n \n \n \n Lévy Flights in Fluid Flows with no Kolmogorov-Arnold-Moser Surfaces.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Antonsen, T. M.; and Ott, E.\n\n\n \n\n\n\n Phys. Rev. Lett., 78: 3864–3867. May 1997.\n \n\n\n\n
\n\n\n\n \n \n \"Lévy journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevLett.78.3864,\n\tauthor = {Venkataramani, Shankar C. and Antonsen, Thomas M. and Ott, Edward},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevLett.78.3864},\n\tissue = {20},\n\tjournal = {Phys. Rev. Lett.},\n\tkeywords = {pubs},\n\tmonth = {May},\n\tnumpages = {0},\n\tpages = {3864--3867},\n\tpublisher = {American Physical Society},\n\ttitle = {L\\'evy Flights in Fluid Flows with no Kolmogorov-Arnold-Moser Surfaces},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevLett.78.3864},\n\tvolume = {78},\n\tyear = {1997},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevLett.78.3864},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevLett.78.3864}}\n\n
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\n  \n 1996\n \n \n (4)\n \n \n
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\n \n\n \n \n \n \n \n \n Riddling Bifurcation in Chaotic Dynamical Systems.\n \n \n \n \n\n\n \n Lai, Y.; Grebogi, C.; Yorke, J. A.; and Venkataramani, S. C.\n\n\n \n\n\n\n Phys. Rev. Lett., 77: 55–58. Jul 1996.\n \n\n\n\n
\n\n\n\n \n \n \"RiddlingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevLett.77.55,\n\tauthor = {Lai, Ying-Cheng and Grebogi, Celso and Yorke, James A. and Venkataramani, S. C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevLett.77.55},\n\tissue = {1},\n\tjournal = {Phys. Rev. Lett.},\n\tkeywords = {pubs},\n\tmonth = {Jul},\n\tnumpages = {0},\n\tpages = {55--58},\n\tpublisher = {American Physical Society},\n\ttitle = {Riddling Bifurcation in Chaotic Dynamical Systems},\n\turl = {http://link.aps.org/doi/10.1103/PhysRevLett.77.55},\n\tvolume = {77},\n\tyear = {1996},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevLett.77.55},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevLett.77.55}}\n\n
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\n \n\n \n \n \n \n \n \n Transitions to Bubbling of Chaotic Systems.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Hunt, B. R.; Ott, E.; Gauthier, D. J.; and Bienfang, J. C.\n\n\n \n\n\n\n Phys. Rev. Lett., 77: 5361–5364. Dec 1996.\n \n\n\n\n
\n\n\n\n \n \n \"Transitions journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevLett.77.5361,\n\tauthor = {Venkataramani, Shankar C. and Hunt, Brian R. and Ott, Edward and Gauthier, Daniel J. and Bienfang, Joshua C.},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevLett.77.5361},\n\tissue = {27},\n\tjournal = {Phys. Rev. Lett.},\n\tkeywords = {pubs},\n\tmonth = {Dec},\n\tnumpages = {0},\n\tpages = {5361--5364},\n\tpublisher = {American Physical Society},\n\ttitle = {Transitions to Bubbling of Chaotic Systems},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevLett.77.5361},\n\tvolume = {77},\n\tyear = {1996},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevLett.77.5361},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevLett.77.5361}}\n\n
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\n \n\n \n \n \n \n \n \n Bubbling transition.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Hunt, B. R.; and Ott, E.\n\n\n \n\n\n\n Phys. Rev. E, 54: 1346–1360. Aug 1996.\n \n\n\n\n
\n\n\n\n \n \n \"Bubbling journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{PhysRevE.54.1346,\n\tauthor = {Venkataramani, Shankar C. and Hunt, Brian R. and Ott, Edward},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {10.1103/PhysRevE.54.1346},\n\tissue = {2},\n\tjournal = {Phys. Rev. E},\n\tkeywords = {pubs},\n\tmonth = {Aug},\n\tnumpages = {0},\n\tpages = {1346--1360},\n\tpublisher = {American Physical Society},\n\ttitle = {Bubbling transition},\n\turl_journal = {http://link.aps.org/doi/10.1103/PhysRevE.54.1346},\n\tvolume = {54},\n\tyear = {1996},\n\tBdsk-Url-1 = {http://link.aps.org/doi/10.1103/PhysRevE.54.1346},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1103/PhysRevE.54.1346}}\n\n
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\n \n\n \n \n \n \n \n \n On-off intermittency: Power spectrum and fractal properties of time series.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Antonsen, T. M.; Ott, E.; and Sommerer, J. C.\n\n\n \n\n\n\n Physica D: Nonlinear Phenomena, 96(1–4): 66 - 99. 1996.\n Measures of Spatio-Temporal Dynamics\n\n\n\n
\n\n\n\n \n \n \"On-off journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{Venkataramani199666,\n\tauthor = {Shankar C. Venkataramani and Thomas M. Antonsen and Edward Ott and John C. Sommerer},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/0167-2789(96)00014-0},\n\tissn = {0167-2789},\n\tjournal = {Physica D: Nonlinear Phenomena},\n\tkeywords = {Invariant manifold; pubs},\n\tnote = {Measures of Spatio-Temporal Dynamics},\n\tnumber = {1--4},\n\tpages = {66 - 99},\n\ttitle = {On-off intermittency: Power spectrum and fractal properties of time series},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/0167278996000140},\n\tvolume = {96},\n\tyear = {1996},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/0167278996000140},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/0167-2789(96)00014-0}}\n\n
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\n  \n 1995\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n \n Blowout bifurcations: Symmetry breaking of spatially symmetric chaotic states.\n \n \n \n \n\n\n \n Ott, E.; Sommerer, J. C.; Antonsen, T. M.; and Venkataramani, S.\n\n\n \n\n\n\n In Shlesinger, M.; Zaslavsky, G.; and Frisch, U., editor(s), Lévy Flights and Related Topics in Physics, volume 450, pages 182-195. Springer Berlin Heidelberg, 1995.\n \n\n\n\n
\n\n\n\n \n \n \"BlowoutPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@incollection{Shlesinger:1995gd,\n\tauthor = {Ott, Edward and Sommerer, John C. and Antonsen, Thomas M. and Venkataramani, Shankar},\n\tbooktitle = {L{\\'e}vy Flights and Related Topics in Physics},\n\tda = {1995/01/01},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2021-05-23 18:54:32 -0700},\n\tdoi = {10.1007/3-540-59222-9{\\_}34},\n\teditor = {Shlesinger, MichealF. and Zaslavsky, GeorgeM. and Frisch, Uriel},\n\tisbn = {978-3-540-59222-8},\n\tkeywords = {pubs},\n\tla = {English},\n\tpages = {182-195},\n\tpublisher = {Springer Berlin Heidelberg},\n\tse = {12},\n\ttitle = {Blowout bifurcations: Symmetry breaking of spatially symmetric chaotic states},\n\ttitle1 = {Blowout bifurcations: Symmetry breaking of spatially symmetric chaotic states},\n\tty = {CHAP},\n\turl = {http://dx.doi.org/10.1007/3-540-59222-9_34},\n\tvolume = {450},\n\tyear = {1995},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1007/3-540-59222-9_34},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1007/3-540-59222-9%7B%5C_%7D34}}\n\n
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\n \n\n \n \n \n \n \n \n Characterization of on-off intermittent time series.\n \n \n \n \n\n\n \n Venkataramani, S. C.; Antonsen, T. M.; Ott, E.; and Sommerer, J. C\n\n\n \n\n\n\n Physics Letters A, 207(3–4): 173 - 179. 1995.\n \n\n\n\n
\n\n\n\n \n \n \"Characterization journal\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{on-off1995,\n\tauthor = {Shankar C. Venkataramani and Thomas M. Antonsen and Edward Ott and John C Sommerer},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tdoi = {http://dx.doi.org/10.1016/0375-9601(95)00710-K},\n\tissn = {0375-9601},\n\tjournal = {Physics Letters A},\n\tkeywords = {Invariant manifold; pubs},\n\tnumber = {3--4},\n\tpages = {173 - 179},\n\ttitle = {Characterization of on-off intermittent time series},\n\turl_journal = {http://www.sciencedirect.com/science/article/pii/037596019500710K},\n\tvolume = {207},\n\tyear = {1995},\n\tBdsk-Url-1 = {http://www.sciencedirect.com/science/article/pii/037596019500710K},\n\tBdsk-Url-2 = {http://dx.doi.org/10.1016/0375-9601(95)00710-K}}\n\n
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\n \n\n \n \n \n \n \n \n Topology of event horizons and topological censorship.\n \n \n \n \n\n\n \n Jacobson, T.; and Venkataramani, S.\n\n\n \n\n\n\n Classical Quantum Gravity, 12(4): 1055–1061. 1995.\n \n\n\n\n
\n\n\n\n \n \n \"Topology journal\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{MR1330301,\n\tauthor = {Jacobson, Ted and Venkataramani, Shankar},\n\tcoden = {CQGRDG},\n\tdate-added = {2017-01-29 16:04:45 +0000},\n\tdate-modified = {2017-01-29 20:11:00 +0000},\n\tfjournal = {Classical and Quantum Gravity},\n\tissn = {0264-9381},\n\tjournal = {Classical Quantum Gravity},\n\tkeywords = {pubs},\n\tmrclass = {83C75 (57N10)},\n\tmrnumber = {1330301 (96e:83055)},\n\tmrreviewer = {Robert J. Low},\n\tnumber = {4},\n\tpages = {1055--1061},\n\ttitle = {Topology of event horizons and topological censorship},\n\turl_journal = {http://stacks.iop.org/0264-9381/12/1055},\n\tvolume = {12},\n\tyear = {1995},\n\tBdsk-Url-1 = {http://stacks.iop.org/0264-9381/12/1055}}\n
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