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X-WR-CALNAME:Namur Institute For Complex Systems
X-ORIGINAL-URL:https://www.naxys.be
X-WR-CALDESC:Events for Namur Institute For Complex Systems
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DTSTART:20150329T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170509T130000
DTEND;TZID=Europe/Paris:20170509T140000
DTSTAMP:20260430T193011
CREATED:20170308T154206Z
LAST-MODIFIED:20170428T110726Z
UID:152-1494334800-1494338400@www.naxys.be
SUMMARY:Nikos Kouvaris ( University Pompeu Fabra)
DESCRIPTION:Title: Pattern formation in bistable networks: Theory and applications to chemical reactions \n  \nAbstract: \nSelf-organization processes in complex networks is an interdisciplinary research field with great theoretical interest and many potential applications in chemistry and biology. Stationary localized patterns constitute a classical example of self-organization; they can spontaneously be generated by the Turing mechanism\, as it has been reported in both continuous and networked media. However\, an alternative mechanism for the emergence of stationary patterns in networks was recently discovered [1-4]. We have experimentally demonstrated and theoretically analyzed that bistable networks can support a rich variety of stationary patterns determined by the network architecture and the initial conditions [2\,3]. By applying a localized perturbation to a network node or a subset of nodes\, we demonstrate the subsequent spreading\, pinning\, or retraction of the activations; such analysis enables the characterization of the formation of stationary patterns of localized activity. Weak coupling results in trivial pinned states where the activation is stationary. At strong coupling\, a uniform state is expected with active or inactive elements at small or large nodes degree\, respectively. Nontrivial stationary spatial patterns\, corresponding to an activation pinning\, are predicted to occur at nodes with intermediate degrees and at intermediate coupling strengths. The results are confirmed in experiments with networks of coupled bistable electrochemical reactions. Although our experimental system is actually more complex than the simplifying assumptions under which the theory was constructed\, the results show a surprisingly good agreement. This indicates that the found pattern formation mechanism is robust and generic. \nIn this talk we discuss theoretical and experimental studies with bistable chemical reactions organized in tree [1\,2] and star [3] networks. These results are relevant for large random networks [2]. Mechanisms for the control and deliberate design of such patterns [4] will also be considered. \nReferences:\n———–\n1. N. E. Kouvaris\, H. Kori and A. S. Mikhailov\, PLoS ONE 7\, e45029 (2012).\n2. N. E. Kouvaris\, M. Sebek\, A. S. Mikhailov and I. Z. Kiss\, Angew. Chem. Int. Ed.\, 55\, 13267-13270 (2016).\n3. N. E. Kouvaris\, M. Sebek\, A. Iribarne\, A. Diaz-Guilera and I. Z. Kiss\, Phys. Rev. E 95\, 042203 (2017).\n4. N. E. Kouvaris and A. S. Mikhailov\, Europhys. Lett. 102\, 16003 (2013).
URL:https://www.naxys.be/event/nikos-kouvaris-university-pompeu-fabra/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170502T130000
DTEND;TZID=Europe/Paris:20170502T140000
DTSTAMP:20260430T193011
CREATED:20170308T152719Z
LAST-MODIFIED:20170416T103118Z
UID:149-1493730000-1493733600@www.naxys.be
SUMMARY:Jan Baert (UGent)
DESCRIPTION:Title: Environmental dependency of biodiversity effects on ecosystem functioning \nAbstract: Expanding human activities are increasingly interfering with Earth’s biogeochemical cycles. This has led to unprecedented global changes in biodiversity and environmental conditions. In the past 3 decades\, ecologists have principally been focusing on whether the functioning of an ecosystem depends on the number of species it contains. There is now ample evidence that biodiversity-ecosystem functioning relationships are generally positive\, and ecosystem function provisioning is at risk by biodiversity loss. However\, evidence is also mounting that the relationship between biodiversity and ecosystem functioning\, and therefore also the consequences of biodiversity changes\, depend on the environmental conditions. In my work\, I ai to explain how biodiversity-ecosystem functioning relationships are affected by changes in environmental conditions. Theoretical models are thereby combined with microcosm experiments to demonstrate how environmental changes lead to predictable changes in biodiversity effects on ecosystem functioning\, and how these changes depend the type of species interactions and species sensitivities to environmental changes. As such\, the presented framework offers new insights in the combined effect of upcoming biodiversity and environmental changes for ecosystem function provisioning.
URL:https://www.naxys.be/event/jan-baert-ugent/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170425T130000
DTEND;TZID=Europe/Paris:20170425T140000
DTSTAMP:20260430T193011
CREATED:20170308T152506Z
LAST-MODIFIED:20170331T155306Z
UID:147-1493125200-1493128800@www.naxys.be
SUMMARY:Francesco Piazza (University of Orléans)
DESCRIPTION:Title: Diffusion of small ligands in complex confining and reactive landscapes:\nthe geometry of chemoreception. \nAbstract: \nThe rate constant that describes the diffusive encounter/reaction between a particle\nand a large sphere can be computed easily by solving the stationary diffusion\n(i.e. Laplace) equation for the particle density with appropriate boundary conditions\nimposed on the surface of the sphere. In one classic\, text-book example\, this calculation is\nused to estimate the binding rate constant of a ligand to a receptor-covered cell.\nBut what happens if the particles are diffusing in the presence of many reactive boundaries\nof different strength (intrinsic reaction rate)\, which compete for the same ligands and amidst\na landscape of inert obstacles? In spite of the apparent overwhelming complexity\, the same mathematical framework as the two-body problem can be used to solve the N-body problem exactly\, by resorting to addition theorems for the appropriate fundamental solutions of the Laplace equation.\nThis powerful mathematical framework allows one to investigate fundamental issues\nthat are central in cell biology and modern nano-sciences\, such as how the specific geometric\nconfigurations of many reactive boundaries shape the overall reaction rate constant.\nWe will illustrate several examples\, including applications to the study of ligand binding\nto arrays of receptors on the surface of a cell and the action of many nano-catalysts embedded within a core-shell nano-reactor.
URL:https://www.naxys.be/event/francesco-piazza-university-of-orleans/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170404T130000
DTEND;TZID=Europe/Paris:20170404T140000
DTSTAMP:20260430T193011
CREATED:20170308T152154Z
LAST-MODIFIED:20170328T210957Z
UID:145-1491310800-1491314400@www.naxys.be
SUMMARY:William Polycarpe (Paris Observatory)
DESCRIPTION:Title: Is Titan responsible for Iapetus’ orbit ? \n  \nAbstract: Latest astrometrical results on Saturnian moons show evidence for high migration rates (Lainey et al. 2012; 2016). The tidal dissipation in the planet is responsible for those large orbital expansions and should therefore be much stronger than usually expected. The idea of significant tidal dissipation in the massive core (Remus et al. 2012) and the convective envelope (Le Guenel et al. 2015; Fuller et al. 2016) of the planet has been brought forward as a likely explanation.\nNevertheless\, high changes in semi-major axes of the moons shuffle up the ideas we had on the past evolution of the system of Saturn. In particular\, depending on tidal mechanisms at play\, several Mean Motion Resonances could have been crossed just a few million years ago.\nIn the frame of high tidal migration\, we investigate the consequences of the past 5:1 mean motion resonance between Titan and Iapetus\, which could have happened between 5 and 500 million years ago. Numerical simulations show that the most common outcome for Iapetus is to be ejected\, as Titan migrates through the resonance. However\, if Titan has a very high recession (Q <2000)\, Iapetus may survive the resonance and come out of it with an eccentricity consistent with today’s value. The effect on Iapetus’ inclination is still under investigation.
URL:https://www.naxys.be/event/william-polycarpe-paris-observatory/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170330T080000
DTEND;TZID=Europe/Paris:20170330T170000
DTSTAMP:20260430T193011
CREATED:20170125T090922Z
LAST-MODIFIED:20170125T090922Z
UID:103-1490860800-1490893200@www.naxys.be
SUMMARY:Hands-on session with GIT.
DESCRIPTION: The train to Brussels costs will be re-imbursed by Naxys. The training itself is free of charge. Agenda will be send around well in advance. \nRegistration is free vut mandatory on: http://doodle.com/poll/bdq4aetpkk6kav9w
URL:https://www.naxys.be/event/hands-on-session-with-git/
LOCATION:Brussels
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170328T130000
DTEND;TZID=Europe/Paris:20170328T140000
DTSTAMP:20260430T193011
CREATED:20170308T150202Z
LAST-MODIFIED:20170310T193806Z
UID:142-1490706000-1490709600@www.naxys.be
SUMMARY:Tarik Roukny (UGent)
DESCRIPTION:Title: Compressing Over-the-counter Markets \n  \nAbstract: In this talk\, we show both theoretically and empirically that the size of over-the-counter (OTC) markets can be reduced without affecting individual net positions. First\, we find that the networked nature of these markets generates an excess of notional obligations between the aggregate gross amount and the minimum amount required to satisfy each individual net position. Second\, we show conditions under which such excess can be removed while preserving individual net positions. We refer to this operation as compression and identify feasibility and efficiency criteria\, highlighting intermediation as the key element for excess levels. We show that a trade-off exists between the amount of notional that can be removed from the system and the conservation of trading relationships. Third\, we apply our theoretical framework to a unique and comprehensive transaction-level dataset on OTC derivatives. We document large levels of excess across all markets and time. Finally\, we show that compression – when applied at a global level  – can reduce a considerable fraction of total notional even under relationship constrained approaches.
URL:https://www.naxys.be/event/tarik-roukny-ugent/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170321T110000
DTEND;TZID=Europe/Paris:20170321T120000
DTSTAMP:20260430T193011
CREATED:20170320T100102Z
LAST-MODIFIED:20170320T100102Z
UID:166-1490094000-1490097600@www.naxys.be
SUMMARY:Ryota Kobayashi (NII\, Tokyo): Inferring synaptic connections from spike data of multiple neurons
DESCRIPTION:Inferring synaptic connections from spike data of multiple neurons: \nAbstract: Correlations in electric activity among neurons are defined as “functional connections”. It is still unclear how the functional connectivity is related to underlying (physiological) synaptic connectivity. Here\, we develop a method for estimating synaptic connections from spike data of multiple neurons. Estimation performance of the proposed method was evaluated by using simulated data generated by a realistic cortical network model (Kitano & Fukai\, 2007). This is joint work with Katsunori Kitano. \nThe meeting will take place at 11H00 in the 4th floor\, Room Camille Joset (401).
URL:https://www.naxys.be/event/ryota-kobayashi-nii-tokyo-inferring-synaptic-connections-from-spike-data-of-multiple-neurons/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170314T130000
DTEND;TZID=Europe/Paris:20170314T140000
DTSTAMP:20260430T193011
CREATED:20170308T144943Z
LAST-MODIFIED:20170308T145553Z
UID:134-1489496400-1489500000@www.naxys.be
SUMMARY:Malbor Asllani (FNRS & NaXys)
DESCRIPTION:Title: Desynchronization of the Kuramoto oscillators. A neurostimulation method for controlling epilepsy seizures \n  \nAbstract: \nMany coordination phenomena are based on a synchronization process\, whose global behavior emerges from the interactions among the individual parts. Often in nature\, such self-organized mechanism allows the system to behave as a whole and thus grounding its very first existence\, or expected functioning\, on such process. There are however cases where synchronization acts against the stability of the system; for instance in some neurodegenerative diseases or epilepsy or the famous case of Millennium Bridge where the crowd synchronization of the pedestrians seriously endangered the stability of the structure. In this talk we propose an innovative control method to tackle the synchronization process based on the application of the Hamiltonian control theory\, by adding a small control term to the system we are able to impede the onset of the synchronisation. We illustrate the effectiveness of our method applying it to control the epileptic seizures.
URL:https://www.naxys.be/event/malbor-asllani-fnrs-naxys/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170309T080000
DTEND;TZID=Europe/Paris:20170309T170000
DTSTAMP:20260430T193011
CREATED:20170125T090749Z
LAST-MODIFIED:20170125T090749Z
UID:96-1489046400-1489078800@www.naxys.be
SUMMARY:Introduction to GIT
DESCRIPTION:Contact Frederik de Laender (frederik.delaender@unamur.be) for details. \nRegistration is free\, but mandatory on: http://doodle.com/poll/bdq4aetpkk6kav9w \nPrecise schedule to be confirmed.
URL:https://www.naxys.be/event/introduction-to-git/
LOCATION:Namur
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170207T130000
DTEND;TZID=Europe/Paris:20170207T140000
DTSTAMP:20260430T193011
CREATED:20170127T090621Z
LAST-MODIFIED:20170127T104053Z
UID:108-1486472400-1486476000@www.naxys.be
SUMMARY:Seminar of Melaine Saillenfest
DESCRIPTION:Affiliations: IMCCE – Observatoire de Paris and Dipartimento di Matematica – Università di Pisa \nTitre : Secular representations for the long-term dynamics beyond Neptune \nAbstract: I will present the development and the application of semi-analytical secular models\, designed to describe generically the long-term dynamics of transneptunian objects. One-degree-of-freedom systems are obtained in both the non-resonant and resonant cases\, allowing to represent every possible trajectory by the level curves of the Hamiltonian. The application to known objects reveals pathways to high perihelion distances. In particular\, distant resonant objects can be tracked back to their resonance capture.
URL:https://www.naxys.be/event/seminar-of-melanie-saillenfest/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20161108T120000
DTEND;TZID=Europe/Paris:20161108T130000
DTSTAMP:20260430T193011
CREATED:20161107T111631Z
LAST-MODIFIED:20161107T111745Z
UID:19-1478606400-1478610000@www.naxys.be
SUMMARY:SQLfast : langage et environnement logiciel pour la manipulation de données par des utilisateur non experts
DESCRIPTION:
URL:https://www.naxys.be/event/sqlfast-langage-et-environnement-logiciel-pour-la-manipulation-de-donnees-par-des-utilisateur-non-experts/
CATEGORIES:NAXYS Seminar
END:VEVENT
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