<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=iso-8859-2"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle20
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle21
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle22
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle23
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle24
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle25
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle26
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle27
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle28
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle29
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle30
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle31
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle32
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle34
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 22. predavanje iz sklopa "Kolokviji na IJS" v letu 2011/12, ki bo <strong><span style='color:red'>v sredo, 6. junija, 2012, 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><o:p> </o:p></p><p class=MsoNormal><b><span style='mso-fareast-language:ZH-CN'>Prof. dr. Stephan Herminghaus<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='mso-fareast-language:ZH-CN'>Max Planck Institute for Dynamics and Self-Organization, Göttingen, Nemčija <o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:14.0pt;mso-fareast-language:SL'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt'>Eksperimenti z aktivnimi emulzijami</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predstavili bomo eksperimente z emulzijami, za katere je značilno raznovrstno aktivno obnašanje. V sistemu vodnih kapljic, ki vsebujejo oscilatorje Belousova in Žabotinskega (BZ), opazimo sklopitvene vzorce, odvisne od tvorbe lipidnih dvoslojev med njimi: tarčaste, kvorumske in spiralne valove v dvorazsežnih zaplatah monodisperznih emulzij. Pri manjšem prostorninskem deležu kapljic se začnejo slednje samodejno gibati in to gibanje je mogoče nadzorovati z BZ reakcijo. Pojav lahko pojasnimo s preprostim mehanizmom, zasnovanim na Marangonijevi mehanični napetosti. Kapljice tvorijo roje z močnimi korelacijami, odvisnimi od gostote kapljic. Energijo za to vrsto gibanja zagotavlja sproščanje broma pri kemijski reakciji. Predstavimo tudi soroden tekočekristalni sistem, ki kaže podobno, a mnogo bolj dolgoživo kolektivno obnašanje, katerega vzrok je spontana tvorba mikroemulzije. Mezoskopska struktura tekočega kristala ne zene le gibanja kapljic, temveč vodi tudi do mnogo kompleksnejših vzorcev, ki jih še ne razumemo v celoti.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v angleščini.<span lang=SL style='mso-fareast-language:SL'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><span style='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 align=center style='text-align:center'>*****<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:EN-US'><br clear=all style='page-break-before:always'></span><p class=MsoNormal style='text-align:justify'>We would like to invite you to 22nd lecture of the "Kolokvij na IJS" in the school year 2011/12. The lecture will be held <b>on Wednesday, June 6, 2012, at 1 pm</b> at the <b>JSI main lecture hall</b>, Jamova 39, Ljubljana. The abstract of the lecture can be found on website: <span style='font-size:10.0pt'><a href="http://www.ijs.si/ijsw/Koledar_prireditev"><span style='font-size:12.0pt'>http://www.ijs.si/ijsw/Koledar_prireditev</span></a></span>, the previous recorded lectures can be found on website: <span style='font-size:10.0pt'><a href="http://videolectures.net/kolokviji_ijs"><span style='font-size:12.0pt'>http://videolectures.net/kolokviji_ijs</span></a></span>.<span style='font-size:10.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>********************************************<b><span lang=SL style='mso-fareast-language:ZH-CN'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='mso-fareast-language:ZH-CN'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='mso-fareast-language:ZH-CN'>Prof. dr. Stephan Herminghaus<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='mso-fareast-language:ZH-CN'>Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:16.0pt;mso-fareast-language:SL'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:16.0pt'>Experiments with active emulsions<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-align:justify'>Experiments are presented with emulsions showing various types of 'active' collective behavior. Ensembles of aqueous droplets containing Belouzov-Zhabotinski (BZ) oscillators are shown to exhibit coupling patterns depending on the formation of lipid bilayers between them. We observe target waves, quorum sensing, and spiral waves in two-dimensional rafts of mono-disperse emulsions. As the volume fraction of the dispersed phase (i.e., the droplets) is reduced, we observe self-propelled motion of the droplets, which can be controlled by the BZ reaction if desired. We propose a simple mechanism based on Marangoni stresses which accounts for this motion. Swarming is shown to exhibit pronounced correlation features which depend strongly on the raft density. While the bromine release provides the energy source for this type of self-propulsion, we present an alternative system based on liquid crystals which shows similar collective behaviour, but whose motion has a longer lifetime and is fuelled by the spontaneous formation of a microemulsion. Based on the meso-structure of the liquid crystal, it enables, aside from simple droplet motion, much more complex patterns to evolve, the details of which are yet far from understood.<o:p></o:p></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt'>We look forward to meeting you at the “Kolokvij na IJS”!<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-align:justify'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></body></html>