Lo studio dell'elettromagnetismo negli ultimi 50 anni: il contributo delle tecnologie informatiche e dei metodi matematici

Abstract

Exact Time: the First Scientific Application of Radiocommunications

Marconi’s first experiment of signal transmission by means of Hertzian waves was carried out in 1895. In the following years, wireless telegraphy progressed steadily and worldwide efforts were made to exploit the potential offered by new technologies. In those years Guido Alfani, a young Florentine Piarist teacher of promise in Seismology, joined the Ximeniano Observatory in Florence where he found the ideal environment for his experiments and his insights. He understood the importance of having the exact time in Seismology, to temporally characterize the telluric movements and therefore accurately characterize them. In 1910 when the Paris radio station located at the Tour Eiffel began regular broadcasts of exact time, he laid down the issue of its reception. As far as pendulums and chronometers were concerned, no doubt his expertise as seismologist was significant, while problems arose when it came to the radio station, due to the novelty of such situation. For this reason he arranged contacts and managed to set the first Italian radio station to be used in a weather station. Thus, on the night of March 16-17, 1912, he received for the first time the time signal for a particular scientific application. He wrote to Marconi and in 1912 Marconi expressed words of great appreciation and encouragement for such work. Father Guido Alfani’s radio station is certainly the first one applied in Seismology and among the first radios made in Italy. It is an extremely important application which demonstrated that the new technique could provide solutions in different situations

La matematica nella modellistica elettromagnetica: alcuni esempi

ItIn questo lavoro sono illustrati alcuni metodi per l'analisi elettromagnetica di strutture la cui dimensione risulta grande in termini di lunghezza d'onda, con lo scopo di evidenziare il loro collegamento con il mondo della matematica. Pur non riportando una casistica esaustiva dei metodi di analisi attualmente impiegati nel campo dell'elettromagnetismo, gli esempi scelti indicano come una accurata formulazione matematica possa ampliare la classe dei problemi analizzabili con una specifica tecnica

Non-Standard Errors

In statistics, samples are drawn from a population in a data-generating process (DGP). Standard errors measure the uncertainty in estimates of population parameters. In science, evidence is generated to test hypotheses in an evidence-generating process (EGP). We claim that EGP variation across researchers adds uncertainty: Non-standard errors (NSEs). We study NSEs by letting 164 teams test the same hypotheses on the same data. NSEs turn out to be sizable, but smaller for better reproducible or higher rated research. Adding peer-review stages reduces NSEs. We further find that this type of uncertainty is underestimated by participants

Lo studio dell'elettromagnetismo negli ultimi 50 anni: il contributo delle tecnologie informatiche e dei metodi matematici

Abstract