Istituto dei sistemi complessi (ISC)

Focus

SPIKY

2016
SPIKY (Kreuz et al., 2015) is a graphical user interface written in Matlab which facilitates the analysis of electrophysiological data such as the EEG and neuronal spike trains (sequences of electrical action potentials emitted by neurons). In addition to the standard Peri-Stimulus Time Histogram (PSTH) it contains several time-resolved measures of spike train synchrony which were all developed in our lab: ISI-distance, SPIKE-distance, and SPIKE synchronization. For a given data set SPIKY ...

Diffusion, what else?

2016
Diffusion essentially refers to a motion which leads to the spreading of some quantity: density of particles, energy, and so on. It owes its universality to the central limit theorem, according to which che combination of independent, random events has general features not related to the details of the single events. For example, in a standard, diffusive motion the spreading quantity does not vary proportionally to the time, but its variation may double only if time quadruples! If however the ...

Rotation of the polarization and easy shear cooperate to boost the piezoelectric effect

2016
Ferroelectrics are materials exhibiting spontaneous polarization and strain below the Curie temperature, so that the application of an electric field produces a deformation and the application of a stress produces an electric field, the so-called piezoelectric effect. For sensor and actuators it is desired that the magnitude of the piezoelectric effect is maximized, and this is often the case near transitions between ferroelectric phases whose spontaneous polarizations are in different ...

Physical realization of the Glauber quantum oscillator

2016
More than 30 years ago, Glauber theorized the existence of quantum systems to explain the link between the reversible microscopic and irreversible macroscopic scale. The formulation of such model is based on the so-called "rigged Hilbert space" and include irreversibility as a fundamental principle through the introduction of an inverted harmonic oscillator describing quantum amplifier. The standard quantum mechanics does not forbid time-travel. However, according to the Glauber theory a quantum ...

The classical and quantum dynamics of molecular spins grafted on graphene

2015
The effect of graphene phonons and electrons on the spin dynamics of molecules grafted on graphene was investigated in a paper published in Nature Materials (C.Cervetti, A.Rettori, M.G.Pini, A.Cornia, A.Repollés, F.Luis, M.Dressel, S.Rauschenbach, M.Burghard, and L.Bogani). Dirac electrons introduce dominant quantum-relaxation channels and allow reaching a quantum tunneling regime, that was predicted 20 years ago by the French physicist Jacques Villain. A novel theoretical background is ...

Tech4Bio

2015
Dal 2013 ISC coordina il gruppo interistituto Tech4Bio, che si compone di ricercatori del CNR con competenze diverse e complementari ma un obiettivo comune di favorire la formazione di una rete scientifica nel campo della Biofisica, del Biosensing e più in generale delle tecnologie per il bio. Il gruppo è composto attualmente da ricercatori di ISC, ISM, IFN, IFT, IDASC (www.tech4bio.eu)ed è coinvolto in una serie di progetti e collaborazioni nei settori della biochimica, microscopia avanzata, ...

Silent Flocks

2015
A paper on the collective behaviour of bird flocks, in which a spin wave model is brought to the continuous limit as in fluid elements of a large hydrodynamic system, has been published in Physical Review Letters and it has been the subject of a synopsis in the APS magazine Physics. Both spin and density waves can propagate throughout flocks, but in some cases their contributions are quickly damped. Andrea Cavagna's group at ISC has shown that only spin waves propagate in medium-to-small ...

La stazione sperimentale INES@ISIS

2008
INES è il nome della Stazione Sperimentale Italiana ad ISIS, la sorgente pulsata di neutroni più brillante del mondo, che si trova presso il Rutherford Appleton Laboratory (U.K.). La stazione sperimentale è dotata di un diffrattometro per neutroni, a tempo di volo, e viene principalmente utilizzata per l'analisi microscopico-strutturale di campioni di interesse archeologico. Dalla sua prima installazione, avvenuta nel Gennaio 2006, lo strumento è stato messo a disposizione della comunità ...

Dispositivi elettronici e rivelatori in diamante CVD.

2007
Il gruppo è da anni impegnato nella progettazione e sviluppo di detector e dispositivi elettronici in diamante CVD. Nell'ambito del Progetto Europeo G5RD-CT2001-00603 Diamond, da noi coordinato dal 2001 al 2005, sono stati realizzati prototipi di dosimetri basati su film di diamante sottile per applicazioni di monitoraggio radioterapico con caratteristiche di elevata resistenza al danno da radiazione, comportamento equivalente al tessuto umano, basso rumore, risposta direttamente proporzionale ...

Diamond detector has three-electrode structure, Laser Focus World, July, 2003

2003
Not only does diamond sparkle--it withstands ionizing radiation, too. Researchers at the University of Rome Tre and CNR, Institute of Inorganic Methodology and Plasmas (both of Rome, Italy) are using the material as a basis for photodetectors that may be well-suited for astronomical use in space, where ions degrade other materials. The detector operates by collecting both photogenerated carriers in the bulk material and photoelectrons emitted from the surface. A 50-µm-thick diamond film is ...