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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 15. predavanje iz sklopa "Kolokviji na IJS" v letu 2017/18, ki bo <strong><span style='color:red'>v sredo, 16. maja 2018, 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 lang=EN-US style='mso-fareast-language:ZH-CN'>prof. dr. Kenji Uchino<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-US style='mso-fareast-language:ZH-CN'>The Pennsylvania State University, State College, ZDA<o:p></o:p></span></i></p><p class=MsoNormal align=center style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:center'><b><span style='font-size:16.0pt'>Sistemi za piezoelektrično zbiranje energije<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'><span lang=EN-US>Zbiranje neizkoriščene ali neuporabljene energije je že dolgo aktualna tema. V predavanju se bomo osredotočili na zbiranje energije iz mehanskih vibracij s piezoelektričnimi pretvorniki, pri čemer bomo obravnavali tri glavne faze tega procesa: (i) prenos mehanske energije vključno z mehansko stabilnostjo piezoelektričnega pretvornika pri velikih napetostih in mehanskim impedančnim ujemanjem, (ii) pretvorbo mehanske energije v električno, ki je povezana z elektromehanskim sklopitvenim faktorjem piezoelektričnega pretvornika, in (iii) prenos električne energije vključno z ujemanjem električne impedance, kar omogoči shranjevanje energije v baterijo za ponovno polnjenje. Običajno se raziskovalci ukvarjajo le z ozkim raziskovalnim področjem, ki se nanaša na eno od omenjenih faz. Podali bomo smernice za celovito strategijo za izboljšanje učinkovitosti sistemov za piezoelektrično zbiranje energije. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v angleščini.<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><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><span style='font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:SL'><br clear=all style='page-break-before:always'></span><p class=MsoNormal><span style='color:black'>We invite you to the 15th Institute colloquium in the academic year 2017/18. The colloquium will be held </span><b><span style='color:red'>on Wednesday May 16, 2018 at 1 PM</span></b><span style='color:red'> in <b>the main Institute lecture hall</b></span><span style='color:black'>, Jamova 39, Ljubljana. To read the abstract click </span><span style='color:#1F497D'><a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>. </span><span style='color:black'>Past colloquia are posted on</span><span style='color:#1F497D'> <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'>********************************************<b><o:p></o:p></b></p><p class=MsoNormal><b><span lang=EN-US>prof. dr. Kenji Uchino<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-US>The Pennsylvania State University, State College, USA<o:p></o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US><o:p> </o:p></span></i></p><p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-US style='font-size:16.0pt'>Piezoelectric energy harvesting systems<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Energy harvesting from wasted or unused power has been the topic of discussion for a long time. This contribution focuses on harvesting energy from mechanical vibrations using piezoelectric transducers. Three major phases/steps associated with piezoelectric energy harvesting are considered: (i) mechanical-mechanical energy transfer, including mechanical stability of the piezoelectric transducer under large stresses, and mechanical impedance matching, (ii) mechanical-electrical energy transduction, relating with the electromechanical coupling factor in the composite transducer structure, and (iii) electrical-electrical energy transfer, including electrical impedance matching, such as a DC/DC converter to accumulate the energy into a rechargeable battery. The problem found in the current research teams is on a narrow research area of each above phase. In order to provide comprehensive strategies on how to improve the efficiency of the harvesting system, general guideline for piezoelectric energy harvesting systems is provided.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cordially invited!<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div></body></html>