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Athens News Agency: News in Greek, 09-10-25

Athens News Agency: News in ASCII Greek Directory - Previous Article - Next Article

From: The Athens News Agency at <http://www.ana.gr/>

PERIEXOMENA
  • [01] "Forhth" mini-mayrh trypa panw sth Gh

    [01] "Forhth" mini-mayrh trypa panw sth Gh

    Gia prwth fora ston kosmo, kinezoi episthmones dhmioyrghsan panw sth Gh mia hlektromagnhtikh "mayrh trypa tsephs", diametroy molis 22 ekatostwn, h opoia royfa to gyrw ths fws kai to metatrepei se qermothta.

    H syskeyh, poy pros to paron leitoyrgei se syxnothtes mikrokymatwn, dhladh mono me aorato fws, mporei syntoma na epektaqei etsi wste na pagideyei kai to orato fws, kati poy qa odhgoyse piqanws se ena neo tropo ajiopoihshs ths hliakhs energeias gia thn paragwgh hlektrismoy.

    Oi "mayres trypes" sto sympan einai asfalws giganties. Ayth poy brisketai sto kentro toy dikoy mas galajia exei ypologistei oti exei maza peripoy 3,6 ekatommyria fores megalyterh apo th maza toy hlioy mas.

    H texnhth mayrh trypa "tsephs" mimeitai tis idiothtes ths kosmologikhs mayrhs trypas, h entonh barythta ths opoias kamptei ton periballonta xwro-xrono "royfwntas" thn perij ylh. H arxikh idea protaqhke fetos apo toys Ebgkeni Narimanof kai Alejanter Kilntisef toy panepisthmioy Perntioy twn HPA. Oi dyo episthmones yposthrijan oti einai dynato na kataskeyastei mia syskeyh poy na kampylwnei to fws pros to kentro ths, "royfwntas" to me paromoio tropo.

    Thn idea anelaban poly grhgora na ylopoihsoyn oi Tie Tzoyn Koyi kai Tsiangk Tsingk toy Notioanatolikoy Panepisthmioy toy Nantzingk sthn Kina. H syskeyh poy eftiajan, apotelei mia "mayrh trypa" gia tis syxnothtes twn mikrokymatwn. Apoteleitai apo 60 omokentres daktylioeideis lwrides "meta-ylikwn" (ta opoia exoyn sto parelqon xrhsimopoihqei gia na dhmioyrghqoyn oi legomenoi "mandyes aoratothtas") poy apoteloyn ena eidos metallikwn "hlektromagnhtikwn anthxeiwn".

    Otan ena hlektromagnhtiko kyma peftei sth syskeyh, pagideyetai, oxi apo th barythta ths, opws symbainei stis kosmologikes mayres trypes, alla apo ta hlektromagnhtika anthxeia poy ephreazoyn ta hlektrika kai magnhtika pedia toy kymatos. Etsi to kyma kaqodhgeitai pros ton pyrhna ths "mayrhs trypas", apb opoy kai aporrofatai. To kyma den janabgainei pote apo th "mayrh trypa", kaqws to aorato fws poy aporrofatai, metatrepetai se qermothta. "Entypwsiasmenos" dhlwse o diashmos fysikos Tzon Pentri toy Impirial Koletz (Imperial College) toy Londinoy, o opoios yphrje prwtoporos sth xrhsh meta-ylikwn ws mandywn aoratothtas.

    H epektash ths syskeyhs, wste na aporrofa kai to orato fws, qa einai pio dyskolh, kaqws ta mhkh kymatos toy oratoy fwtos einai poly mikrotera apb ayta twn mikrokymatwn, me synepeia na prepei kai h syskeyh na ginei poly pio mikrh. Oi kinezoi episthmones pantws, dhlwsan aisiodojoi oti mporoyn na to kanoyn, isws malista mexri to telos toy 2009.

    Mia tetoia syskeyh, an ontws kataskeyastei, metajy allwn, qa mporoyse na syllegei thn hliakh energeia se merh opoy h hliakh aktinobolia einai poly diaxyth gia na estiastei se mia hliakh kycelh. Mia optikh "mayrh trypa" qa royfoyse tis hliakes aktines kai qa tis kateyqyne se mia hliakh kycelh egkatesthmenh ston pyrhna ths "mayrhs trypas".

    H anakalych paroysiasthke sto periodiko efarmosmenhs fysikhs "Applied Physics Letters", symfwna me to "New Scientist" kai to "Nature".

    Link: Gia thn prwtotyph episthmonikh ergasia sth dieyqynsh: http://arxiv.org/abs/0910.2159v1


    Athens News Agency: News in ASCII Greek Directory - Previous Article - Next Article
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