Una delle risorse considerate scarse della tecnologia contemporanea è lo spettro elettromagnetico.
Forse non tutti sanno che lo spettro elettromagnetico, alla base di buona parte delle tecnologie elettroniche contemporanee e che va dall’infrarosso all’ultravioletto, non è una risorsa illimitata.
Questo vuol dire che le frequenze elettromagnetiche “buone” per le radiocomunicaizoni (satelliti, cellulari, wifi) sono ben precise e non possono essere usate senza discrimine, perchè c’è un limite all’uso della banda passante.
Il grafico che vedete qui in basso rappresenta l’organizzazione dello spettro elettromagnetico e di quanto esso sia strategico per le attuali comunicazioni.
[Infopusher: Datavisualization.ch]
Ciao Davide,
simpatico vedere la telefonia mobile, le migliaia di parole e gli sms del mondo raccolti nella “cavea” in basso a destra.
Mettendo sui tre assi concessione, autorizzazione e armonizzazione dello spettro l’ectoplasma potrebbe manifestarsi in 3D 😉
ciao, Lino.
ps: http://www.fub.it/osservatorio/dossieruewireless/lusoarmonizzatodellospettroradio
Durch den Kohleabbau der Deutsche Steinkohle AG im Kohlefeld Primsmulde (Drei-Standorte-Konzept der Saarbergwerke AG
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Oktober 1998 waren sämtliche Saarbergwerke mit den Ruhr- und Rheingruben zur RAG
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Infolge des Deutschen Krieges von 1866 wurde Nassau von Preußen annektiert.
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When the ancient Greeks adopted the alphabet, they had no use for a letter representing a
glottal stop—so they adapted the sign to represent the
vowel /a/, calling the letter by the similar name alpha.
The earliest known ancestor of A is aleph—the first letter
of the Phoenician alphabet—where it represented a glottal stop [ʔ], as Phoenician only used consonantal letters.
A, or a, is the first letter and the first vowel letter of the Latin alphabet,
used in the modern English alphabet, and others worldwide.
Before a consonant sound represented by a vowel letter a is usual
In the Phoenician alphabet the letter stood for a species of breathing, as
vowels were not represented in the Semitic alphabets.
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In the earliest Greek inscriptions dating to the 8th century BC following the Greek Dark Ages, the letter
rests upon its side. Its name in most other languages matches the letter’s pronunciation in open syllables.
Learn a new word every day. In the King James Version of the Old Testament and
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with initial h both a and an are used in writing.
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