- semfis - Mailing lists@ IFISC

Talk on Thursday, Jul 13, 2023 at 12:00
by semfis＠ifisc.uib-csic.es 07 Jul '23

07 Jul '23

Talk on Thursday Jul 13, 2023 at 12:00 Place: IFISC Seminar Room Title: Harnessing ordered chaotic systems for quantum reservoir computing Speaker: Guillem Llodrà Bisellach, IFISC Abstract: Quantum reservoir computing (QRC) exploits the dynamical properties of quantum systems for machine learning tasks. We show that optimal performance in QRC can be achieved without resorting to disordered systems. Typically, QRC uses dynamical systems with all-to-all topology and random coupling to avoid redundancies. However, our work explores the emergence of a chaotic phase resulting from the competition between coupling and interaction terms in the one-dimensional Bose-Hubbard model with homogeneous coupling. Our results challenge established design principles and suggest simpler and more efficient implementations of QRC. &nbsp; Presential in the seminar room, and Zoom stream at&nbsp; zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/harnessing-ordered-chaotic-systems-for-quantum-res/

1 0

Reminder: Talk, TODAY - Friday, Jul 07, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 07 Jul '23

07 Jul '23

Talk on Friday Jul 07, 2023 at 11:00 Place: IFISC Seminar Room Title: Lagrangian transport of floating plastics at local and regional scales using MOHID-Lagrangian Speaker: Sara Cloux, IFISC Abstract: Marine litter has become an increasingly concerning issue in recent years, largely due to the global population growth. Poor management of plastic waste leads to its accumulation in seas and oceans, creating a widespread problem. Once these plastics reach the marine environment, they undergo a prolonged process of degradation, transitioning from a macro state (plastics with a diameter greater than 0.5 cm) to a micro state (less than 0.5 cm in diameter). Microplastics disperse throughout the oceans, entering the marine food chain and ultimately affecting humans. Therefore, it is crucial to address this issue at the macro scale. In this study, we present the validation of a Lagrangian computational model developed to track the movement of macroplastics in seas and oceans. The validation process focuses on a regional scale, specifically the Arousa Estuary, which is renowned for its mussel farming in northwestern Spain. The significance of this research lies in the comparison of model-predicted accumulation results with the actual accumulation data collected from Galician beaches. Furthermore, we investigate various sources of plastic pollution along the Atlantic coast of Spain, including both land-based and maritime origins, as well as those originating from rivers. The talk can also be followed by zoom: https://us06web.zoom.us/j/89748012069?pwd=S2JQaUFxV0lTWXI4WVZKcVlMK0w4dz09 &nbsp; Url event:https://ifisc.uib-csic.es/en/events/seminars/lagrangian-transport-of-floating-plastics-at-local/

1 0

Talk on Friday, Jul 07, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 04 Jul '23

04 Jul '23

Talk on Friday Jul 07, 2023 at 11:00 Place: IFISC Seminar Room Title: Lagrangian transport of floating plastics at local and regional scales using MOHID-Lagrangian Speaker: Sara Cloux, IFISC Abstract: Marine litter has become an increasingly concerning issue in recent years, largely due to the global population growth. Poor management of plastic waste leads to its accumulation in seas and oceans, creating a widespread problem. Once these plastics reach the marine environment, they undergo a prolonged process of degradation, transitioning from a macro state (plastics with a diameter greater than 0.5 cm) to a micro state (less than 0.5 cm in diameter). Microplastics disperse throughout the oceans, entering the marine food chain and ultimately affecting humans. Therefore, it is crucial to address this issue at the macro scale. In this study, we present the validation of a Lagrangian computational model developed to track the movement of macroplastics in seas and oceans. The validation process focuses on a regional scale, specifically the Arousa Estuary, which is renowned for its mussel farming in northwestern Spain. The significance of this research lies in the comparison of model-predicted accumulation results with the actual accumulation data collected from Galician beaches. Furthermore, we investigate various sources of plastic pollution along the Atlantic coast of Spain, including both land-based and maritime origins, as well as those originating from rivers. Url event:https://ifisc.uib-csic.es/en/events/seminars/lagrangian-transport-of-floating-plastics-at-local/

1 0

Webinar
by Maxi San Miguel 26 Jun '23

26 Jun '23

This webinar might be of interest for you https://zoom.us/webinar/register/WN_jsgReSpzSR-L-2SA5h0Nwg#/registration Heterogeneity extends criticality-Exploring the latest research in Frontiers in Complex Systems Carlos Gershenson, Thursday July 13, 5pm CET -- ***************************************************************** Maxi San Miguel, Emeritus Prof. IFISC (CSIC-UIB) Instituto de Física Interdisciplinar y Sistemas Complejos Campus Universitat Illes Balears E-07122 Palma de Mallorca, Spain https://ifisc.uib-csic.es/people/maxi-san-miguel/ Tel. +34-971-173229; Fax: +34-971-173248 email: maxi(a)ifisc.uib-csic.es *****************************************************************

1 0

Reminder: Talk, TODAY - Monday, Jun 26, 2023 at 15:00
by semfis＠ifisc.uib-csic.es 26 Jun '23

26 Jun '23

Talk on Monday Jun 26, 2023 at 15:00 Place: IFISC Seminar Room Title: A city digital twin for a sustainable mobility: big data analytics and predictive models Speaker: Armando Bazzani, Universita di Bologna Abstract: City digital twin is fundamental to realize the transition to a sustainable mobility in the next future. This is not a digital copy of the city, but a system of data-driven dynamical models, that describe the mobility on the transport networks using different spatial and time scale levels, from the traffic flows dynamics up to the individual behaviour. Indeed, the mobility demand is realized in a multilayer structure of mobility networks and the models must integrate the different mobility types distinguishing different individual behaviours. Moreover, the dynamical models must give predictions on possible scenarios for the city mobility when new infrastructures are built, or new policies for the development of a sustainable mobility are implemented. The first step toward the realization of a digital twin is to collect &rsquo;big data&rsquo; to get information on the present mobility state of a city (i.e. the congestion degree) distinguishing the different types of mobility, and to model the mobility demand. The main data sources are ICT data at individual level or real time data from many distributed sensors on the road network. In the seminar we illustrate the recent results on the use of GPS data from mobile phones to distinguish different types of mobility in a city, and the possibility of building dynamical models to predict the traffic flows on a road network using the collected data from distributed sensors. Zoom: https://tinyurl.com/bdfcrbhp Url event:https://ifisc.uib-csic.es/en/events/seminars/a-city-digital-twin-for-a-sustainable-mobility-big/

1 0

Talk on Monday, Jun 26, 2023 at 15:00
by semfis＠ifisc.uib-csic.es 23 Jun '23

23 Jun '23

Talk on Monday Jun 26, 2023 at 15:00 Place: IFISC Seminar Room Title: A city digital twin for a sustainable mobility: big data analytics and predictive models Speaker: Armando Bazzani, Universita di Bologna Abstract: City digital twin is fundamental to realize the transition to a sustainable mobility in the next future. This is not a digital copy of the city, but a system of data-driven dynamical models, that describe the mobility on the transport networks using different spatial and time scale levels, from the traffic flows dynamics up to the individual behaviour. Indeed, the mobility demand is realized in a multilayer structure of mobility networks and the models must integrate the different mobility types distinguishing different individual behaviours. Moreover, the dynamical models must give predictions on possible scenarios for the city mobility when new infrastructures are built, or new policies for the development of a sustainable mobility are implemented. The first step toward the realization of a digital twin is to collect &rsquo;big data&rsquo; to get information on the present mobility state of a city (i.e. the congestion degree) distinguishing the different types of mobility, and to model the mobility demand. The main data sources are ICT data at individual level or real time data from many distributed sensors on the road network. In the seminar we illustrate the recent results on the use of GPS data from mobile phones to distinguish different types of mobility in a city, and the possibility of building dynamical models to predict the traffic flows on a road network using the collected data from distributed sensors. Zoom: https://tinyurl.com/bdfcrbhp Url event:https://ifisc.uib-csic.es/en/events/seminars/a-city-digital-twin-for-a-sustainable-mobility-big/

1 0

Reminder: Talk, TODAY - Thursday, Jun 22, 2023 at 12:00
by semfis＠ifisc.uib-csic.es 22 Jun '23

22 Jun '23

Talk on Thursday Jun 22, 2023 at 12:00 Place: IFISC Seminar Room Title: Instability-driven turbulence Speaker: Edgar Knobloch, University of California, Berkeley Abstract: Recent progress in understanding instability-driven turbulence in both two (2D) and three (3D) dimensions will be described. Turbulence in 3D is characterized by a forward transfer of energy, to small scales, while in 2D energy is transferred is in the opposite direction, towards larger scales. When driven by a prescribed stochastic force, the latter leads to the formation of large scale structures in the form of vortices or jets. When the turbulence is driven instead by a wavenumber-localized instability superposed on stochastic forcing, the inverse energy transfer may be arrested and no large scale condensate forms. We find that when a control parameter measuring the fraction of energy injected by the instability is increased, the system undergoes two transitions. Below a first threshold, a regular large-scale vortex condensate (LSC) forms. Crossing this threshold shielded vortices (SVs) emerge and coexist with the condensate. At a second threshold, the condensate breaks down, and a gas of weakly interacting vortices with broken symmetry spontaneously emerges, characterized by the preponderance of vortices of one sign only and suppressed inverse energy cascade. I will compare this 2D phenomenology with that observed in highly anisotropic but three-dimensional systems focusing on condensate formation in rapidly rotating Rayleigh-Benard convection via both reduced dynamics and direct numerical simulations of the Navier-Stokes equation. Url event:https://ifisc.uib-csic.es/en/events/seminars/instability-driven-turbulence/

1 0

Reminder: IFISC Seminar, TODAY - Wednesday, Jun 21, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 21 Jun '23

21 Jun '23

IFISC Seminar on Wednesday Jun 21, 2023 at 14:30 Place: IFISC Seminar Room Title: Resolution of a hundred year old problem on lattice random walks and its application to study inert and reactive interactions in complex systems Speaker: L. Giuggioli, Bristol U Abstract: In many complex systems the emergence of spatio-temporal patterns depends on the interaction between pairs of individuals, agents or subunits comprising the whole system. Theoretical predictions of such patterns rely upon quantifying when and where interaction events occur. Even in simple scenarios when the dynamics are Markovian, it has been difficult to obtain estimates of interactions since the analysis has mostly relied upon time-consuming methodologies in the form of stochastic simulations or the numerical solution of challenging boundary value partial differential equations (PDE). Space-time discrete models can instead offer a practical solution given their ability to deal with any type of boundary constraint, but they require knowledge of the analytic solution of the discrete diffusion equation (DDE) in arbitrary dimensions and arbitrary boundary conditions, a problem that has remained open for a long time since the introduction of lattice random walks by Smoluchowski. Armed with exact solution of the DDE, I will introduce a general formalism that allows to quantify inert (probability preserving) and reactive (probability non-preserving) interactions. Example applications include the random movement in hexagonal and triangular lattices, the dynamics of resetting random walks, animal thigmotaxis, the exact prediction of the basic reproduction number, as well as the derivation of a new fundamental PDE beyond the Smoluchowski equation in presence of permeable barriers. Url event:https://ifisc.uib-csic.es/en/events/seminars/resolution-of-a-hundred-year-old-problem-on-lattic/

2 1

Reminder: Outreach Event, TODAY - Tuesday, Jun 20, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 20 Jun '23

20 Jun '23

Outreach Event on Tuesday Jun 20, 2023 at 11:00 Place: Aula Magna, Ed. Guillem Cifre de Colonya Title: Investigación interdisciplinar en epidemias desde la Plataforma de Salud Global del CSIC: ¿preparados para la próxima pandemia? Speaker: Margarita del Val, Centro de Biología Molecular Severo Ochoa CBM-CSIC, Coordinadora de la PTI+ Salud Global del CSIC Abstract: The CSIC Representation in the Balearic Islands, the University of the Balearic Islands (UIB) and the Institute of Cross-disciplinary Physics in Complex Systems (IFISC, UIB-CSIC) are organizing the lecture&nbsp;&quot;Investigaci&oacute;n interdisciplinar en epidemias desde la Plataforma de Salud Global del CSIC: &iquest;preparados para la pr&oacute;xima pandemia?&quot;&nbsp;given by the leading scientist Margarita del Val. As coordinator of the CSIC Global Health Platform and expert in immunity and vaccines against viral diseases, Margarita del Val will share her valuable knowledge and experience in this scientific dissemination activity. The lecture will take place on Tuesday 20 June at 11 am, in the Aula Magna of the Guillem Cifre de Colonya building, on the UIB campus. Admission is free and open to the public.&nbsp; More information:&nbsp;<a href="https://ifisc.uib-csic.es/en/news/conference-scientist-margarita-del-val/">https://ifisc.uib-csic.es/en/news/conference-scientist-margarita-del-val/</a> <ul> </ul> Url event:https://ifisc.uib-csic.es/en/events/seminars/investigacion-interdisciplinar-en-epidemias-desde/

1 0

Reminder: Talk, TODAY - Tuesday, Jun 20, 2023 at 15:31
by semfis＠ifisc.uib-csic.es 20 Jun '23

20 Jun '23

Talk on Tuesday Jun 20, 2023 at 15:31 Place: IFISC Seminar Room Title: On the formation of coral reefs Speaker: Miguel Álvarez, IFISC (CSIC-UIB) Abstract: In this study, we present a novel model that successfully replicates the observed formations of coral reefs. Our proposed model is based on partial differential equations and incorporates the wealth of knowledge accumulated over the past decades regarding the physical and ecological interactions occurring at the micro- and mesoscales within these systems. These interactions include clonal growth, facilitation, the uptake of resources by corals, and the supply of these resources by ocean water currents, among others. Through the mathematical analysis of this model using bifurcations theory, we uncover that the interplay of only a few parameters of the model is sufficient to elucidate the emergence of various reef shapes found in nature. This includes the formation of fringing reefs, closed atolls, and the inner structures within closed atolls. Our findings provide valuable insights into the underlying mechanisms driving the diverse morphologies observed in coral reefs. Url event:https://ifisc.uib-csic.es/en/events/seminars/on-the-formation-of-coral-reefs/

1 0