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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">DĂky Jakube.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Holt dobrý kantor se pozná!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">ZdravĂm<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">KruÄŤinskĂ˝<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> hw-list-bounces@list.hw.cz [mailto:hw-list-bounces@list.hw.cz]
<b>On Behalf Of </b>Šerých Jakub<br>
<b>Sent:</b> Tuesday, January 22, 2013 10:54 AM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> RE: Brněnštà vědci otestovali vlečný paprsek. Sci-fi se stává realitou<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ta vÄ›c je známa a pouĹľĂvá se uĹľ nÄ›kolik let. Ĺekl bych, Ĺľe pĹ™Ănos brĹákĹŻ je jen v jinĂ˝ch geometriĂch laserĹŻ a vyuĹľitĂch jinĂ˝ch polarizacĂ.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jak to funguje? Je to jednoduše Ĺ™eÄŤeno ledniÄŤka na atomy, která dokáže jejich teplotu snĂĹľit na pouhĂ˝ch nÄ›kolik tisĂcin kelvina, tedy tĂ©měř na teplotu absolutnĂ
nuly. Dělá se to, velmi zjednodušeně řečeno, lehoulilililince podladěnou frekvencà zářenà laseru oproti určité spektrálnà čáře daného atomu (molekuly). Protože frekvence je podladěná, je laser schopen interagovat jen s atomy, které se brownovým pohybem zrovna
pohybujĂ smÄ›rem od nÄ›j (dopplerĹŻv jev). KdyĹľ zářenĂ s takovĂ˝m atomem zarezonuje a podařà se mu excitovat elektron, ten po dobÄ› svĂ©ho Ĺľivota spadne zpÄ›t na základnĂ hladinu. JenĹľe vyzářà energii odpovĂdajĂcĂ pĹ™esnÄ› spektrálnà čáře, nikoliv spektrálnà čáře posunutĂ©
o dopplerĹŻv posuv.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">No a protoĹľe jak já studentĹŻm s oblibou Ĺ™Ăkám energie se nemĂhá, ale nĂ˝há (jinĂ˝mi slovy energie fotonu E = nĂ˝ . h, kde nĂ˝ je jeho frekvence a h Planckova konstanta),
tak tĂm vznikne energetickĂ˝ dluh, kterĂ˝ se musĂ splatit z kinetickĂ© energie onoho postiĹľenĂ©ho atomu. BrownĹŻv pohyb atomu se tedy pĹ™ibrzdĂ, neboli atomu se snĂžà teplota. Nebo chcete-li laser, kterĂ˝ mu v jeho pohybu svĂtil "do zad" ho pĹ™ibrzdĂ (tak trochu pĹ™itáhne
k sobÄ›). Vše samozĹ™ejmÄ› skonÄŤĂ na teplotÄ› absolutnĂ nuly, kterĂ© se navĂc nedá nikdy dosáhnout, protoĹľe rozdĂl energiĂ se pĹ™i zpomalovánĂ stále zmenšuje. ŽádnĂ© skuteÄŤnĂ© taĹľenĂ atomĹŻ laserem tedy nehrozĂ ani v nejmenšĂm. NavĂc celĂ© se to odehrává v ultramalĂ˝ch
poÄŤtech atomĹŻ. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">To, Ĺľe se pak brĹákĹŻm zaÄŤaly shlukovat pĹ™isuzuji tomu, Ĺľe kinetická energie brownova pohybu dosáhla hodnot menšĂch, neĹľ energie van der ValsovĂ˝ch sil mezi tÄ›mi
atomy (molekulami).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">PřÚernĂ˝ je na tom ten titulek, jinak ta vÄ›c urÄŤitÄ› reálnÄ› funguje (zhruba v mezĂch toho, co jsem popsal).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jakub Šerých
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:hw-list-bounces@list.hw.cz">hw-list-bounces@list.hw.cz</a> [<a href="mailto:hw-list-bounces@list.hw.cz">mailto:hw-list-bounces@list.hw.cz</a>]
<b>On Behalf Of </b>KruÄŤinskĂ˝ Ladislav<br>
<b>Sent:</b> Tuesday, January 22, 2013 9:59 AM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> RE: Brněnštà vědci otestovali vlečný paprsek. Sci-fi se stává realitou<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">A proÄŤ by to nemÄ›lo mĂt reálnĂ˝ podklad ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jenom proto, Ĺľe si kaĹľdĂ˝ hned pĹ™edstavĂ poletovánĂ vesmĂrem a StarTrek ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jaderná fĹŻze je pokud vĂm taky zvládnutá v experimentálnĂch podmĂnkách a po krátkĂ˝ okamĹľik. JenĹľe pĹ™enĂ©st to do praxe se tĹ™eba ještÄ› x-let nepodaĹ™Ă.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">ZdravĂm<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">KruÄŤinskĂ˝<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:hw-list-bounces@list.hw.cz">hw-list-bounces@list.hw.cz</a> [<a href="mailto:hw-list-bounces@list.hw.cz">mailto:hw-list-bounces@list.hw.cz</a>]
<b>On Behalf Of </b>ÄŚestmĂr Dobosz<br>
<b>Sent:</b> Tuesday, January 22, 2013 9:49 AM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> OT: Brněnštà vědci otestovali vlečný paprsek. Sci-fi se stává realitou<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://magazin.e15.cz/veda-a-technika/brnensti-vedci-otestovali-vlecny-paprsek-sci-fi-se-stava-realitou-950152">http://magazin.e15.cz/veda-a-technika/brnensti-vedci-otestovali-vlecny-paprsek-sci-fi-se-stava-realitou-950152</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">HustĂ˝, co ???<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">... ještě originál pro procvičenà angličtiny:
<a href="http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2012.332.html">
http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2012.332.html</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">ÄŤestmĂr<o:p></o:p></span></p>
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