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Athens News Agency: News in Greek, 09-08-17

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

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

PERIEXOMENA
  • [01] Tropikh kataigida pro twn pylwn ths Floridas
  • [02] Kanei ta ktiria... aorata!

    [01] Tropikh kataigida pro twn pylwn ths Floridas

    Dyo tropikes kataigides, poy metatopizontai apo xqes sthn Karaibikh kai toy Kolpoy toy Mejikoy, kinoyntai epikindyna sthn perioxh, me thn kataigida Mpil na apeilei me anatajh ths se kyklwna kai thn Klontet na etoimazetai na plhjei th Florida apo shmera.

    Oi dyo kataigides, mazy me mia trith thn Ana, h opoia exei ypobaqmisqei hdh, einai oi prwtes kataigides poy shmeiwnontai gia fetos, se mia anapantexa hremh kalokairinh periodo twn kataigidwn ston Atlantiko, h opoia jekinhse stis arxes Ioynioy.

    H kataigida Mpil akomh brisketai poly anatolika, 2.315 xlm anatolika apo tis Mikres Antilles, opws anakoinwse ta mesanykta, wra Ellados, to Eqniko Kentro Kyklwnwn sto Maiami ths Floridas. Thn kataigida, poy kineitai me taxythta 26 xlm/wra, synodeyoyn anemoi entashs 100 xlm/wra.

    ``H Mpil anamenetai na anataxqei se kyklwna argotera apoce, h ayrio'', tonizei sto idio anakoinwqen toy to Kentro.

    Shmera h Florida anamenetai na dexqei megalo ogko broxhs kai na mastigwqei apo isxyroys anemoys kaqws h kataigida Klontet kateyqenetai sthn amerikanikh xersonhso. Stis 03.00, wra Ellados, h kataigida apeixe 155 xlm apo thn Pensakola ths Floridas, kai ekineito me 19 xlm/wra, synodeyomenh apo anemoys entashs 85 xlm/wra.

    [02] Kanei ta ktiria... aorata!

    Meta ton "mandya aoratothtas" panw ston opoio ergazontai pyretwdws oi episthmones, me stoxo mellontika na metatrepoyn opoiodhpote antikeimeno se aorato, twra oi ereynhtes anakoinwsan oti brhkan tropo na kanoyn oysiastika ta ktiria "aorata" stoys seismoys! An teleiopoihqei, h "magikh" syskeyh qa mporei na prostateysei apo to pio mikro spiti mexri ton pio megalo oyranojysth, akoma kai apo ton pio isxyro seismo.

    Oi seismoi, to fws toy hlioy kai to radiofwno exoyn ena koino shmeio: ola diadidontai mesw kymatwn. H monh diafora, kata toys episthmones, einai oti ta seismika kymata einai toso isxyra (h energeia toys mporei na isodynamei me arketes pyrhnikes bombes) poy einai se qesh na tarakoynoyn ta ktiria.

    Mia omada episthmonwn apo to galliko panepisthmio ths Aij-Massalias kai to bretaniko panepisthmio toy Liberpoyl aneptyjan ena "fragma" poy apomonwnei ta ktiria apo thn epidrash twn seismikwn kymatwn, me synepeia ta ktiria na mhn "niwqoyn" to seismo. H sxetikh episthmonikh ergasia dhmosieythke sto periodiko fysikhs "Physical Review Letters".

    H prwtotyph texnologia basizetai se mia idea analogh me ayth poy exei efarmostei sta "aorata" apo ta rantar maxhtika aeroskafh (Stealth), ta opoia xrhsimopoioyn syndyasmoys eidika diamorfwmenwn kai kataskeyasmenwn ylikwn poy aporrofoyn ta shmata toy rantar kai ta ektrepoyn apo thn poreia toys.

    Sthn periptwsh twn seismwn, h nea texnologia kanei kati paromoio. Xrhsimopoiwntas kompioyter, oi ereynhtes kataskeyasan to montelo mias syskeyhs poy apoteleitai apo diadoxikoys omokentroys daktylioys plastikoy, xalkoy kai tessarwn allwn meta-ylikwn diaforetikhs eykamcias, poy ola einai eidika sxediasmena gia na "ejostrakizoyn" me ablabh tropo ta eperxomena seismika kymata.

    Se mia seira apo prosomoiwseis ston ypologisth, oi ereynhtes bombardisan to daktylio gyrw apo ena ktirio me to isodynamo epifaneiakwn seismikwn kymatwn diaforwn syxnothtwn (30 ews 150 Hertz). Se oles tis periptwseis, oi prostateytikoi daktylioi aporrofhsan kai ejetrecan apo thn poreia toys ta kymata toy seismoy, xwris oysiastika na enoxlhsoyn kaqoloy to ktirio sto eswteriko toy daktylioy. Ta ktiria toy mellontos qa mporoysan na einai efodiasmena me tetoioys daktylioys prostasias, poy qa ta kanoyn "aorata" stoys seismoys.

    "Epanastatikh" xarakthrisan thn idea o fysikos Tzon Pentri toy Imperial College toy Londinoy kai o fysikos Oylf Leonarnt toy panepisthmioy Sen Antrioys ths Skwtias, symfwna me thn hlektronikh yphresia toy periodikoy "Science". Prin tria xronia o Pentri, o Leonarnt kai synergates toys hsan oi prwtoi poy, se jexwristes ergasies toys sto "Science", dhmosieysan tis prwtes protaseis gia th dhmioyrgia syskeywn "aoratothtas".

    Sto metajy diasthma, h idea exei gnwrisei tromerh anaptyjh dieqnws kai hdh anaptyssontai texnologies gia epiteyjh "aoratothtas" oxi mono se sxesh me ta kymata toy fwtos, alla epishs oson afora ta kymata toy hxoy, ta kymata toy neroy kai, twra pleon, ta kymata twn seismwn. Sthn teleytaia pantws periptwsh, qa xreiastei arketos xronos mexri na kataskeyastei h prwth pragmatika leitoyrgikh syskeyh prostasias apo ta seismika kymata.

    Syndesmos gia thn prwtotyph episthmonikh ergasia, sth dieyqynsh:

    http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000103000002024301000001&idtype=cvips&gifs=yes


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