BEGIN:VCALENDAR VERSION:2.0 PRODID:icalendar-ruby CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VTIMEZONE TZID:Europe/Vienna BEGIN:DAYLIGHT DTSTART:20260329T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZNAME:CEST END:DAYLIGHT BEGIN:STANDARD DTSTART:20261025T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:CET END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1784038500@ist.ac.at DTSTART:20260714T161500 DTEND:20260714T180000 DESCRIPTION:Speaker: Lihan Wang\nhosted by Giovanni Briganti\nAbstract: Abs tract: In this talk\, we discuss the long-time behavior of three most com monly used piecewise deterministic samplers\, namely Randomized Hamiltonia n Monte Carlo (RHMC)\, Zigzag process (ZZP) and Bouncy Particle Sampler (B PS). All of these\, alongside kinetic Langevin dynamics\, are second-order lifts of the overdamped Langevin dynamics. The kinetic samplers are advan tageous due to its potentially accelerated long-time convergence rates and high accuracy in numerical implementation. We discuss the long-time behav ior of these samplers\, in both L^2 energy and relative entropy\, and show case the difference between these dynamics\, as well as the difference bet ween L^2 energy and entropy\, explaining why the convergence results in en tropy cannot be generalized to entropy. Joint works with Jianfeng Lu (Duke ) and Pierre Monmarché (U Gustave Eiffel). LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101 )\, ISTA ORGANIZER:Birgit.Oosthuizen-Noczil@ist.ac.at SUMMARY:Lihan Wang: Long-time behavior of piecewise deterministic samplers: from energy to entropy\, convergence and non-convergence URL:https://talks-calendar.ista.ac.at/events/6545 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1784278800@ist.ac.at DTSTART:20260717T110000 DTEND:20260717T120000 DESCRIPTION:Speaker: Christine Fiedler\nhosted by Edouard Hannezo\nAbstract : Thermoelectric materials can directly convert between heat and electrici ty\, offering a route toward sustainable energy generation. However\, thei r use remains limited to niche applications due to high fabrication costs and relatively low efficiencies compared to competing energy technologies. Tin chalcogenides such as SnSe and SnS are promising candidates and\, whe n processed via solution-based routes\, provide a scalable and lower-cost alternative to conventional solid-state synthesis\, opening pathways towar d broader adoption. However\, realizing their full potential in polycrysta lline form requires a deeper understanding of how defects\, dopants\, and microstructure govern charge and heat transport.This thesis demonstrates t hat\, in solution-processed materials\, dopants including those introduced unintentionally through precursor chemistry\, are not just confined to sp ecific lattice sites. Instead\, they distribute across the microstructure\ , partitioning within grain interiors\, grain boundaries\, and segregated regions\, where they govern grain growth\, carrier concentration\, and cha rge transport. Through a systematic study of alkali metals and lead halide s in SnSe and SnS\, this work links synthesis\, defect partitioning\, micr ostructure evolution\, and thermoelectric performance reshaping how high-p erformance p- and n-type thermoelectric materials are designed. LOCATION:Sunstone Bldg / Ground floor / Big Seminar Room B (I23.EG.102) and Zoom\, ISTA ORGANIZER: SUMMARY:Christine Fiedler: Thesis Defense: Mechanistic Insight into Solutio n-Processed P-type Tin Chalcogenides as a Basis for Designing their N-type Analogs URL:https://talks-calendar.ista.ac.at/events/6530 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1785229200@ist.ac.at DTSTART:20260728T110000 DTEND:20260728T120000 DESCRIPTION:Speaker: Miguel Cueto Noval\nhosted by Carrie Bernecky\nAbstrac t: The widespread adoption of apps like Whatsapp and Signal has translated into billions of people all around the world communicating on a regular b asis by making use of services that offer end-to-end encryption and even p rovide security guarantees when a user's device is compromised.This was ma de possible by the introduction of the Double Ratchet Algorithm\, which wa s designed for a setting where communication takes place between two parti es. However\, in practice\, many apps offer the possibility of creating gr oups. The protocols they use to secure communication are inefficient for l arge group which has the undesirable consequence that the aforementioned a pps have established limits on the group size of roughly 1000 users. This has motivated the introduction of the Messaging Layer Security (MLS) stand ard by the IETF which is based on a primitive called Continuous Group Key Agreement (CGKA).This primitive allows a group of users to maintain a shar ed secret key that is frequently rotated by the group members in order to change group membership\, achieve forward secrecy (FS) and post compromise security (PCS). Most protocols are based on binary trees where the nodes are associated to a pair formed by public key and a secret key. Each leaf corresponds to one of the group members and a user knows the secret keys a ssociated to nodes along the path from their leaf to the root. When a user wants to update their key material they have to change $ \\log(N) $ many keys. This requires uploading $ \\log(N) $ many ciphertexts to communicate the new keys to the rest of the group members in a way that respects the tree structure.In this thesis we study how much communication between grou p members is required in order to add and remove users from a group as wel l as in order to provide PCS when we consider CGKAs built using standard c ryptographic primitives like pseudo-random functions and public-key encryp tion. Furthermore\, we also consider the case of MLS and provide the first lower bound showing that its communication complexity is much worse than previously believed\, i.e.\, it is very far from $ \\log(N) $. Finally\, w e also propose a variant of MLS which provably achieves the same security properties with a much lower communication cost. LOCATION:Moonstone Bldg / Ground floor / Seminar Room C (I24.EG.030c ) and Zoom\, ISTA ORGANIZER: SUMMARY:Miguel Cueto Noval: Thesis Defense: Towards Efficient Secure Group Messaging URL:https://talks-calendar.ista.ac.at/events/6544 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1785740400@ist.ac.at DTSTART:20260803T090000 DTEND:20260807T140000 DESCRIPTION: LOCATION:Moonstone Seminar Center\, ISTA ORGANIZER:eurowd-2026@ista.ac.at SUMMARY:24th European Workshop on White Dwarfs URL:https://talks-calendar.ista.ac.at/events/6292 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1785744000@ist.ac.at DTSTART:20260803T100000 DTEND:20260803T110000 DESCRIPTION:Speaker: Felix Pertl\nhosted by Georgios Katsaros\nAbstract: Co ntact electrification (CE) is a simple yet elusive phenomenon that occurs when two materials come into contact and separate\, leaving behind net ele ctrical charge. Despite its ubiquity\, the microscopic origin of CE remain s unclear. In this thesis\, we investigate CE from three complementary per spectives: developing a quantitative method to measure charge at the nanos cale\, exploring the dynamic behavior of charge on insulating surfaces\, a nd uncovering the role of mechanical history in forming a triboelectric se ries.In the first part\, we establish a rigorous framework for converting qualitative Kelvin probe force microscopy (KPFM) voltage maps into quantit ative charge density distributions. Using finite element method (FEM) simu lations\, we determine the point-spread function of the KPFM tip–sample geometry and demonstrate that the true surface charge can be reconstructed by numerical deconvolution. This procedure enables the recovery of both t he magnitude and sign of charge density with high fidelity\, resolving nan oscale features that are otherwise obscured. Applying the method to contac t-charged SiO$_2$ surfaces\, we show that existing analytical approximatio ns\, such as parallel plate or spherical models\, can miscalculate charge magnitude by orders of magnitude. Our hybrid FEM/KPFM approach therefore p rovides a fast and general method to convert qualitative KPFM signals into quantitative charge data\, enabling nanoscale charge mapping under realis tic experimental conditions.In the second part\, we study the temporal sta bility of CE-induced charges and identify the key material factors that de termine whether KPFM can capture meaningful charge patterns. Through time- resolved experiments combining a custom-built transfer system with both mi croscopic and macroscopic measurements\, we demonstrate that only the best insulators\, such as SiO$_2$\, preserve CE charge long enough for station ary imaging. For less conductive polymers\, such as PDMS\, charge decays w ithin the duration of a single KPFM scan due to bulk conduction. Using a s imple capacitor-based model\, we reproduce the observed decay dynamics and confirm that the transferred charge decays characteristic to the sample's bulk conductivity. Further\, we always observe homogeneous charge transfe r.In the third part\, we address the question: can we form a triboelectric series with identical materials? Using controlled repetitive contact expe riments\, we show that nominally identical materials can progressively ord er themselves into a triboelectric series\, where surfaces with more conta ct history charge negatively relative to fresher ones. By constructing a m inimal model based on this contact bias''\, we replicate the evolution fro m random to ordered charging observed in experiments. Supporting surface a nalyses\, including atomic force microscopy\, reveal that repeated contact induces nanoscale morphological changes\, suggesting a mechanism tightly coupled to mechanical strain. These results highlight the crucial role of surface history and nanoscale mechanics in dictating charge transfer\, mot ivating further exploration of mechanisms such as mechanochemical bond cle avage and flexoelectric polarization. LOCATION:Sunstone Bldg / Ground floor / Big Seminar Room B (I23.EG.102) and Zoom\, ISTA ORGANIZER: SUMMARY:Felix Pertl: Thesis Defense: Experimental probing of nanoscale char ge features and surface morphology changes during tribocharging URL:https://talks-calendar.ista.ac.at/events/6537 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1785744000@ist.ac.at DTSTART:20260803T100000 DTEND:20260803T110000 DESCRIPTION:Speaker: Marek Randuch\nhosted by Michael Sixt\nAbstract: Root growth inhibition (RG) by auxin and other cues (e.g. eATP\, RALF peptide) involves rapid\, non-transcriptional pathways. Specific steps leading to g rowth inhibition are unclear. Notably\, the RG inhibition is associated wi th increases in cytosolic Ca2+\, plasma membrane depolarization and apopla st alkalization. However\, the causal relationship between them is unclear . To untangle these processes\, we utilized multiplexed reporter imaging to observe pairwise the real-time dynamics of these three processes. Furth ermore\, we tested causal relationships. We employed microfluidics for rap id medium exchange and leveraged new optogenetically regulated channels.  Our comprehensive approach uncovered a network with tight feedback loops. Results indicate that cytosolic Ca2+ serves as the universal initial signa l\, triggering both plasma membrane depolarization and subsequent apoplast alkalization following auxin perception. his conclusion provides a basis for the fundamental regulatory mechanism governing growth but also opens q uestions about the molecular mechanisms behind it. LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101 ) and Zoom\, ISTA ORGANIZER: SUMMARY:Marek Randuch: Thesis Defense: Fast growth responses in plants: Pho spho‐proteomic and growth regulation URL:https://talks-calendar.ista.ac.at/events/6553 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1789983000@ist.ac.at DTSTART:20260921T113000 DTEND:20260921T123000 DESCRIPTION:Speaker: Lena Schwarz & Jiawei Bao LOCATION:ISTA | Central Building | Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Lena Schwarz & Jiawei Bao: ISTA PostDoc Award URL:https://talks-calendar.ista.ac.at/events/6386 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1790089200@ist.ac.at DTSTART:20260922T170000 DTEND:20260922T180000 DESCRIPTION: LOCATION:Dr. Ignaz Seipel-Platz 2\, 1010 Vienna\, Austria\, ISTA ORGANIZER: SUMMARY:ÖAW-ISTA Lecture Prof. Klaus Robert Müller URL:https://talks-calendar.ista.ac.at/events/6288 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1790341200@ist.ac.at DTSTART:20260925T150000 DTEND:20260925T180000 DESCRIPTION:hosted by ISTA\nAbstract: Join a lively peertopeer event design ed for postdocs navigating the job search.Share practical tips\, vent comm on frustrations\, celebrate successes\, and exchange honest advice — all in a relaxed speednetworking format that reminds you: you’re not alone in this process!Food\, fun\, facilitation\, and meaningful connections inc luded.The Maria Gugging hills are waiting for you! LOCATION:Moonstone Seminar Room F+G\, ISTA ORGANIZER:boris.cesnik@ista.ac.at SUMMARY:PAW Closure Networking Event URL:https://talks-calendar.ista.ac.at/events/6495 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1790587800@ist.ac.at DTSTART:20260928T113000 DTEND:20260928T123000 DESCRIPTION:Speaker: Francesco Locatello\nhosted by Christoph Lampert LOCATION:Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Francesco Locatello: Tenure Talk | Francesco Locatello URL:https://talks-calendar.ista.ac.at/events/6548 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1791192600@ist.ac.at DTSTART:20261005T113000 DTEND:20261005T123000 DESCRIPTION:Speaker: Friedrich Stricker & Yuval Wigderson\nhosted by Mikhai l Lemeshko LOCATION:ISTA | Central Building | Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Friedrich Stricker & Yuval Wigderson: Inaugural Lecture | Friedrich Stricker & Yuval Wigderson URL:https://talks-calendar.ista.ac.at/events/6357 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1794220200@ist.ac.at DTSTART:20261109T113000 DTEND:20261109T123000 DESCRIPTION:Speaker: Lauren O'Connell\nhosted by Lora Sweeney LOCATION:Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Lauren O'Connell: Institute Colloquium | Lauren O'Connell URL:https://talks-calendar.ista.ac.at/events/6550 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1794825000@ist.ac.at DTSTART:20261116T113000 DTEND:20261116T123000 DESCRIPTION:Speaker: Vivian Kuperberg & Carla Fernandez-Rico\nhosted by Mik hail Lemeshko LOCATION:ISTA | Central Building | Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Vivian Kuperberg & Carla Fernandez-Rico: Inaugural Lecture | Vivian Kuperberg & Carla Fernandez-Rico URL:https://talks-calendar.ista.ac.at/events/6389 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1795429800@ist.ac.at DTSTART:20261123T113000 DTEND:20261123T123000 DESCRIPTION:Speaker: Kim Modic\nhosted by Mikhail Lemeshko LOCATION:ISTA | Central Building | Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Kim Modic: Tenure Talk | Kim Modic URL:https://talks-calendar.ista.ac.at/events/6390 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1796639400@ist.ac.at DTSTART:20261207T113000 DTEND:20261207T123000 DESCRIPTION:Speaker: Daniel Robert\nhosted by Scott Waitukaitis LOCATION:Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Daniel Robert: Institute Colloquium | Daniel Robert URL:https://talks-calendar.ista.ac.at/events/6551 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1797244200@ist.ac.at DTSTART:20261214T113000 DTEND:20261214T123000 DESCRIPTION:Speaker: Monika Visan & Simone Fatichi LOCATION:Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Monika Visan & Simone Fatichi: Inaugural Lecture | Monika Visan & S imone Fatichi URL:https://talks-calendar.ista.ac.at/events/6552 END:VEVENT BEGIN:VEVENT DTSTAMP:20260710T223220Z UID:1800268200@ist.ac.at DTSTART:20270118T113000 DTEND:20270118T123000 DESCRIPTION:Speaker: Lora Sweeney\nhosted by Mario de Bono LOCATION:ISTA | Central Building | Raiffeisen Lecture Hall\, ISTA ORGANIZER:diana.zubcevic@ista.ac.at SUMMARY:Lora Sweeney: Tenure Talk | Lora Sweeney URL:https://talks-calendar.ista.ac.at/events/6387 END:VEVENT END:VCALENDAR