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2.
Nat Commun ; 14(1): 7013, 2023 Nov 14.
Article in English | MEDLINE | ID: mdl-37963921

ABSTRACT

Earth's atmosphere, whose ionization stability plays a fundamental role for the evolution and endurance of life, is exposed to the effect of cosmic explosions producing high energy Gamma-ray-bursts. Being able to abruptly increase the atmospheric ionization, they might deplete stratospheric ozone on a global scale. During the last decades, an average of more than one Gamma-ray-burst per day were recorded. Nevertheless, measurable effects on the ionosphere were rarely observed, in any case on its bottom-side (from about 60 km up to about 350 km of altitude). Here, we report evidence of an intense top-side (about 500 km) ionospheric perturbation induced by significant sudden ionospheric disturbance, and a large variation of the ionospheric electric field at 500 km, which are both correlated with the October 9, 2022 Gamma-ray-burst (GRB221009A).

3.
Neural Comput ; 21(11): 3106-29, 2009 Nov.
Article in English | MEDLINE | ID: mdl-19686067

ABSTRACT

We describe the implementation and illustrate the learning performance of an analog VLSI network of 32 integrate-and-fire neurons with spike-frequency adaptation and 2016 Hebbian bistable spike-driven stochastic synapses, endowed with a self-regulating plasticity mechanism, which avoids unnecessary synaptic changes. The synaptic matrix can be flexibly configured and provides both recurrent and external connectivity with address-event representation compliant devices. We demonstrate a marked improvement in the efficiency of the network in classifying correlated patterns, owing to the self-regulating mechanism.


Subject(s)
Evoked Potentials/physiology , Neural Networks, Computer , Neurons/physiology , Synapses/physiology , Calcium Signaling/physiology , Computer Systems , Humans , Learning , Long-Term Potentiation , Microcomputers , Models, Neurological , Neuronal Plasticity/physiology
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