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</o:shapelayout></xml><![endif]--></head><body lang=SL link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Vabimo vas na 15. predavanje iz sklopa "Kolokviji na IJS" v letu 2018/19, ki bo <strong><span style='color:red'>v sredo, 10. aprila 2019, 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'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<strong><span style='color:red'><o:p></o:p></span></strong></p><p class=MsoNormal style='text-align:justify'><b><span lang=EN-US>prof. dr. Matthias Sperl</span></b><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal style='text-align:justify'><i><span lang=EN-US>Deutsches Zentrum für Luft- und Raumfahrt, Köln, Nemčija<o:p></o:p></span></i></p><p class=MsoNormal style='text-align:justify'><i><span lang=EN-US><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:14.0pt'>Idealna stanja granularnih snovi v vesolju<o:p></o:p></span></b></p><p class=MsoNormal style='text-align:justify'>Takoj za vodo so granularne snovi najbolj uporabljani materiali ali snovna stanja v industriji. Kljub tehniškemu pomenu se raziskav fizikalnih osnov granularnih snovi lotevamo šele v zadnjem času. Glavna ovira pri opisu granularnih snovi s statistično fiziko je močan vpliv neravnovesne dinamike: zaradi izgube energije se že pri trku dveh delcev zlomi simetrija na obrat časa, tako da so granularne snovi izven ravnovesja in s tem teoretični in eksperimentalni izziv. <o:p></o:p></p><p class=MsoNormal style='text-align:justify'>Poleg tega so granularne snovi z različnimi gostotami zelo občutljive za vpliv težnosti. Zato je izvajanje eksperimentov v mikrogravitaciji cesto koristno ali celo nujno: na Zemlji se granularni plini hitro sedimentirajo, granularne kapljevine so močno anizotropne, v granularnih skladih pa imamo velike gradiente tlaka. V vseh naštetih stanjih nudijo eksperimenti na platformah kot so parabolični let, stolp za prosti pad, raziskovalne rakete in Mednarodna vesoljska postaja vpogled v obnašanje v idealnih ansamblov v mikrogravitaciji, kjer lahko granularne pline vzbujamo homogeno, granularne kapljevine opazujemo v izotropnih okoliščinah in granularne trdnine raziskujemo brez gradientov.<o:p></o:p></p><p class=MsoNormal style='text-align:justify'>Za karakterizacijo teh idealnih stanj uporabljamo vrsto diagnostičnih pristopov od videa, sipanja svetlobe, rentgenske radiografije, dvolomnosti zaradi mehaničnih napetosti do širjenja zvoka. V predavanju bomo orisali, kako lahko rezultati tovrstnih eksperimentov nudijo vpogled v obnašanje granularnih snovi in prispevajo k globljemu razumevanju.<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.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><span style='color:red'>Lepo vabljeni!<o:p></o:p></span></strong></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:212.4pt;text-indent:35.4pt'>********<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 lang=EN-US style='color:black'>We invite you to the 15th Institute colloquium in the academic year 2018/19. The colloquium will be held </span><b><span lang=EN-US style='color:red'>on Wednesday, April 10, 2019 at 13 PM</span></b><span lang=EN-US style='color:red'> in <b>the main Institute lecture hall</b></span><span lang=EN-US style='color:black'>, Jamova 39, Ljubljana. To read the abstract click </span><a href="http://www.ijs.si/ijsw/Koledar_prireditev"><span lang=EN-US>http://www.ijs.si/ijsw/Koledar_prireditev</span></a><span lang=EN-US style='color:#1F497D'>. </span><span lang=EN-US style='color:black'>Past colloquia are posted on</span><span lang=EN-US style='color:#1F497D'> </span><a href="http://videolectures.net/kolokviji_ijs"><span lang=EN-US>http://videolectures.net/kolokviji_ijs</span></a><span lang=EN-US style='color:#1F497D'>.<o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US>********************************************<b><o:p></o:p></b></span></p><p class=MsoNormal><b><span lang=EN-US>prof. dr. Matthias Sperl<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-US>Deutsches Zentrum für Luft- und Raumfahrt, Köln, Germany<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><i><span lang=EN-US><o:p> </o:p></span></i></p><p class=Default align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Times New Roman",serif;color:windowtext;mso-fareast-language:SL'>Ideal states of granular matter in space<o:p></o:p></span></b></p><p class=Default><span lang=EN-US style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal style='text-align:justify'>Second only to water in volume, granular matter is the most frequently used material or material state in industry. Despite its importance in engineering, many physical foundations of granular matter are only now being investigated. A major obstacle to describe granular matter within statistical physics is the strong influence of out-of-equilibrium dynamics: Already the two-particle collision breaks time-reversal symmetry due to energy loss and renders granular systems out-of-equilibrium and thus a challenge in theory and experiment alike.<o:p></o:p></p><p class=MsoNormal style='text-align:justify'>In addition, granular matter at different densities is strongly susceptible to the influence of gravity. Hence, experiments require and can benefit from experiments in microgravity: On ground, granular gases sediment quickly, agitated granular fluids are strongly anisotropic, and granular packings exhibit large gradients in pressure. For all three of those states, experiments on several platforms such as parabolic flight, drop tower, sounding rocket and International Space Station demonstrate access to unique and ideal ensembles under microgravity. Granular gases can be agitated homogeneously, granular fluids observed under isotropic conditions, and granular solids monitored free of gradients. <o:p></o:p></p><p class=MsoNormal style='text-align:justify'>In order to characterize those ideal states a variety of diagnostics can be applied: video imaging, light-scattering, X-ray radiography, stress birefringence, and sound transmission. A synopsis shall be given how the results from these experiments provide valuable insights into the behavior of granular matter and contribute to a deeper understanding. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cordially invited!<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;mso-fareast-language:EN-US'><o:p> </o:p></span></p></div></body></html>