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</o:shapelayout></xml><![endif]--></head><body lang=SL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 17. predavanje iz sklopa "Kolokviji na IJS" v letu 2014/15, ki bo <strong><span style='color:red'>v sredo, 22. aprila 2015, ob 13. uri </span></strong><span style='color:red'>v Veliki predavalnici Instituta »Jožef Stefan«</span> na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>, posnetke preteklih predavanj<span style='color:blue'> </span>pa na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>. <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></p><p class=MsoNormal><b><span style='mso-fareast-language:ZH-CN'>doc. dr. Slavko Bernik<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='mso-fareast-language:ZH-CN'>Odsek za nanostrukturne materiale, Institut Jožef Stefan, Ljubljana, Slovenija<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center;line-height:18.0pt'><b><span style='font-size:14.0pt;font-family:"Cambria","serif"'>Fenomen inverznih mej in rasti zrn v keramiki cinkovega oksida za prenapetostne zaščite<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center;line-height:18.0pt'><i><span style='font-size:14.0pt;font-family:"Cambria","serif"'>Zgodba o »kavnih zrnih« ZnO ali vpliv ploskovnih napak na varistorsko keramiko <o:p></o:p></span></i></p><p class=MsoNormal align=center style='text-align:center;line-height:18.0pt'><b><span style='font-size:14.0pt;font-family:"Cambria","serif"'><o:p> </o:p></span></b></p><p class=MsoNormal style='text-align:justify'><span style='font-size:11.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Motnje napetosti v električnem omrežju, katerih vzrok so najpogosteje udari strel, stalno ogrožajo varno delovanje električnih naprav in sistemov, od katerih je tako močno odvisno naše vsakdanje življenje. Varistorji zagotavljajo prenapetostno zaščito v področju od nekaj voltov do več sto tisoč voltov na način, da niti ne vemo, da je do motnje sploh prišlo. Kljub tako širokemu napetostnemu področju delovanja so varistorji izdelani iz zelo podobne varistorske keramike na osnovi ZnO, ki se razlikuje le v velikosti zrn. Obvladovanje rasti zrn je zato ključnega pomena za izdelavo varistorske keramike z ustrezno prebojno napetostjo, pri kateri hipno preide iz izolatorskega v visoko prevodno stanje. V predavanju bomo predstavili problematiko prenapetostnih zaščit in raziskave, s katerimi smo prepričljivo ovrgli dotedanje razumevanje razvoja mikrostrukture v varistorski keramiki in pojasnili dejanski mehanizem rasti zrn pod vplivom ploskovnih napak v zrnih ZnO. Vprašanje, kaj počnejo v varistorski keramiki »kavna zrna« <span lang=EN-US>–</span> tam so namreč podobna zrna ZnO, ki vsebujejo ploskovno napako <span lang=EN-US>–</span>, je privedlo do spoznanj, ki močno vplivajo na nadaljnji razvoj varistorjev. <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v slovenščini.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><span style='font-family:"Calibri","sans-serif";color:red'>Lepo vabljeni!</span></strong><strong><span style='font-weight:normal'><o:p></o:p></span></strong></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'><o:p> 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