In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
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Asteroseismology: Studying angular momentum transfer mechanisms in red giant stars15m
Asteroseismic observations from missions such as MOST, CoRoT, Kepler and upcoming TESS and PLATO, make available a large amount of data, broadening our knowledge of pulsating stars by enabling even further the possibility to model and probe the stellar interiors.
Nonetheless, core rotation rates obtained via asteroseismic observations show a large discrepancy with stellar evolution models predictions. Measurements of red giant stars reveal that their cores rotate much faster than their surfaces, but much slower than theoretically predicted. Therefore, it must exist some additional transport processes, that maintain conservation of total angular momentum, while redistributing angular momentum in these stars.
The project consists in implementing the evolution of a low mass star model, with two chosen angular momentum transfer mechanisms, Taylor-Spruit Dynamo (2002) and Fuller Mechanism (2019), using the open source Modules for Experiments in Stellar Astrophysics (MESA). The goal is to give more insight into the impact of this mechanisms on the internal structure of the red giant stars, through asteroseismic diagnosis, for future comparisons with experimental data.
Stability of circular orbits in the 3 body problem15m
The 3 body problem has been studied for the last few centuries. While there are some known particular solutions, like the Euler and Lagrange solutions, and some specific cases, like the restricted 3 body problem, that have been more thoroughly studied, our knowledge about this topic is far from complete.
The N body problem can be reduced to a system of equations whose only parameters are the masses of the bodies involved. These equations show that in a limit where masses are small, the orbits tend to become Keplerian. This work will focus on identifying stability conditions for the parameters that allow the existence of stable periodic orbits in a general 3 body problem configured as a planetary system, i.e., 2 bodies (planets) orbiting the 3rd one (a star). Preliminary results already suggest the existence of a limited interval for the masses for which the systems are stable.
Results obtained from this study will serve as a foundation for a cornerstone of this work, the search for stable orbits in the N body problem, in order to shed some light on the structure of our Solar System, on the formation of planetary systems and planets by accretion, and on empirical and unexplained observations such as the Titius-Bode law.
Self-Organization of Learning Rules15m
Evolutionary Game Theory defines a mathematical framework to study the evolving dynamics of communities in biology or social sciences, typically in regimes where the evolution is deterministic. In this framework, the cooperative strategy updating is commonly based on relative payoff comparison and social learning by natural selection. However, in the real world it might be different, as individuals may not follow a social learning behaviour. In this study we propose a stochastic evolutionary game dynamics asymmetric model, for finite populations, in which individuals may adopt three different behaviours to update strategy: social learning, conformism or counterfactual thinking. We analyze these behaviours impact on the gradient of selection and on the fixation probability in a N-person group community.
Smart fingertip biossensors for agrorobotics applications15m
In the agricultural business, as well as in distribution networks and packaging industry, food items suffer changes that need to be controlled. In particular, in fruit/vegetable handling there is crescent effort to introduce automated technologies for manipulation and optical inspection of fruits/vegetables. In this project we will implement a biosensor that allows for a quick evaluation of the quality of the fruit/vegetable when being handled by a robotic hand. Particularly, the student will dedicate himself to develop e-skin technologies and sensors embedded in elastomers and artificial skin, in a way that combines the tactile ability with a more sensitive perception of texture. Various detection strategies will be probed, with the implementation in a multiparametric integrated sensor in a robotic hand as the final goal.
PALS – Setup optimisation and application to macromolecular materials characterisation15m
One of the fundamental structural aspects in soft condensed matter is the free volume, which include atomic defects, vacancies, pores and voids, which exists in the interior of matter, due to irregular packing, density fluctuations and topological constrains. The free volume is considered as the volume fraction enabling molecular reorganisation and is of fundamental importance in influencing a material’s physical, chemical and mechanical properties.
Positron annihilation lifetime spectroscopy (PALS) is a non-destructive spectroscopy technique that enables a complete study of the free volume structure in materials, especially regarding the existence, dimension and concentration of these free volumes. PALS is based on the measurement of the elapsed time between the implantation of positrons into the material and the emission of the radiation resultant from the positron-electron annihilations. The lifetime of positrons is different for the ones which annihilate in the bulk of the material and the ones which annihilate in its free volumes. Therefore, the lifetime of the positron can then be used to determine the free volume size and concentration of the sample.
Then, this work aims at the experimental optimisation of a PALS spectrometer, with a subsequent application of this tuned experimental setup to the characterisation of macromolecular materials, namely radiation processed polymer-based and hybrid materials for biomedical applications and for the consolidation of stone-based materials.