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ARPI, l'Archivio della Ricerca dell'Università di Pisa, raccoglie le pubblicazioni e la documentazione sui prodotti della ricerca scientifica del personale dell'ateneo. L'archivio è gestito da IRIS, il sistema di gestione integrata dei dati della ricerca del CINECA.
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Multiple Consequences Induced by Epidermally-Located Anthocyanins in Young, Mature and Senescent Leaves of Prunus

Anthocyanic morphs are generally less efficient in terms of carbon gain, but, in turn, are more photoprotected than anthocyanin-less ones. To date, mature leaves of different morphs or leaves at different developmental stages within the same species have generally been compared, whereas ...

Libraries, linguistics and artificial intelligence: J. C. R. Licklider and the libraries of the future

In 1965, J. C. R. Licklider published a book regarding the "Libraries of the future". This book was soon almost forgotten when a different paradigm of computing, partially created by Licklider himself, became dominant. However, a re-reading of the book, in hindsight, not ...

High density piecewise syndeticity of product sets in amenable groups

M. Beiglböck, V. Bergelson, and A. Fish proved that if G is a countable amenable group and A and B are subsets of G with positive Banach density, then the product set AB is piecewise syndetic. This means that there is a finite subset E of G such that E...

Idempotent ultrafilters without Zorn’s Lemma

We introduce the notion of additive filter and present a new proof of the existence of idempotent ultrafilters on N without using Zorn’s Lemma in its entire power, and where one only assumes the Ultrafilter Theorem for the continuum.

Periodic Preamble-Based Frequency Recovery in OFDM Receivers Plagued by I/Q Imbalance

The direct conversion receiver (DCR) architecture has received much attention in the last few years as an effective means to obtain user terminals with reduced cost, size, and power consumption. A major drawback of a DCR device is the possible insertion of I/Q imbalances ...

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