Hydrodynamic instabilities in active cholesteric liquid crystals

We describe the basic properties and consequences of introducing active stresses, with principal direction along the local director, in cholesteric liquid crystals. The helical ground state is found to be linearly unstable to extensile stresses, without threshold in the limit of infinite system size, whereas contractile stresses are hydrodynamically screened by the cholesteric elasticity to give a finite threshold. This is confirmed numerically and the non-linear consequences of instability, in both extensile and contractile cases, are studied.

Le diverse declinazioni della matematica per lo sviluppo dell'intelligenza artificiale nei seminari "AIM - Fundamentals and beyond".

Tra novembre 2020 e giugno 2021, l'Istituto per le Applicazioni del Calcolo "Mauro Picone" (IAC) ha realizzato un ciclo di seminari dedicati al rapporto tra Intelligenza Artificiale e Matematica, denominato AIM - Artificial Intelligence and Mathematics - Fundamentlas and beyond.

Final MIPAS L1 and L2 V8 full mission reprocessing, lessons learnt and possible further improvements

MIPAS is a Fourier Transform spectrometer that measured the atmospheric limb emission spectra in the middle infrared on board the ENVISAT satellite. These measurements allowed the global monitoring of the three-dimensional (latitude, longitude and altitude) distribution of temperature and of the concentrations of many species, during both day and night, for 10 years, from July 2002 to April 2012. MIPAS measurements allowed to study the atmosphere from the upper troposphere to the stratosphere and above, up to the thermosphere.

Degrado meccanico e chimico di materiali lapidei di importanza storico-ambientale

Progetto basato sullo sviluppo di modelli e metodi matematico-numerici per l'analisi di processi di degrado chimico (solfatazione, corrosione del ferro) e meccanico (danneggiamento, fratture). La finalità è di produrre gli strumenti per: a) simulare tali processi per poterli prevedere ed intervenire preventivamente, b)effettuare un monitoraggio a distanza, ovviamente non invasivo.

ENIGMA: modelling of Boulder Clay Glacier (Northern Foothills) and initiation of biological and biogeochemical studies of its glacial lakes

The Boulder Clay (BC) glacier and the surrounding area, partially covered by rock, ice and moraines, are considered by structure and morphology suitable to host a helicopter runway that would support the work efficiency of "Mario Zucchelli" Station and other international operational bases nearby. Actually the quasi-imperceptible slope of the bottom and the rocky containment walls make that area stable and easy to be converted.

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