BEGIN:VCALENDAR VERSION:2.0 PRODID:-//UM//UM*Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Detroit TZURL:http://tzurl.org/zoneinfo/America/Detroit X-LIC-LOCATION:America/Detroit BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20070311T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20071104T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20250908T150809 DTSTART;TZID=America/Detroit:20251017T143000 DTEND;TZID=America/Detroit:20251017T153000 SUMMARY:Workshop / Seminar:RTG NT: Duality theorems DESCRIPTION:TBA UID:138970-21884382@events.umich.edu URL:https://events.umich.edu/event/138970 CLASS:PUBLIC STATUS:CONFIRMED CATEGORIES:Mathematics LOCATION:East Hall - 4088 CONTACT: END:VEVENT BEGIN:VEVENT DTSTAMP:20251010T130933 DTSTART;TZID=America/Detroit:20251017T150000 DTEND;TZID=America/Detroit:20251017T160000 SUMMARY:Lecture / Discussion:AIM Seminar: The impact of ephaptic coupling and ionic electrodiffusion on arrhythmogenesis in the heart DESCRIPTION:Abstract: Cardiac action potential (AP) propagation occurs through gap junction (GJ)-rich intercalated discs (IDs). However\, recent experimental studies show that GJ knockout mice can still maintain heart structure and function\, even though GJs are undetectable at IDs. Ephaptic coupling (EpC)\, an electric field effect across the narrow and tortuous ID\, offers an alternative mechanism for cell-to-cell communication when GJs are impaired. Given the current absence of direct experimental evidence for the existence of EpC\, modeling studies are essential for understanding its physiological and pathological roles in the heart. Myocardial ischemia\, caused by coronary artery blockage\, induces major electrophysiological and structural remodeling\, including disrupted GJs and steep electrochemical gradients that impair ion channel function and promote arrhythmias. Our research investigates how EpC and ionic electrodiffusion influence conduction and arrhythmogenesis in both healthy and ischemic hearts\, with a focus on EpC mechanisms. We developed first two-dimensional (2D) multidomain electrodiffusion model that incorporates EpC\, laying the groundwork for future mechanistic studies. Our findings demonstrate that sufficiently strong EpC suppresses the initiation of reentry\, leading to absent or nonsustained reentrant activity with a reduced maximum dominant frequency (DF)\, although it can also introduce transient instability and heterogeneity into cardiac dynamics. In contrast\, relatively weak EpC supports sustained reentry\, characterized by a stable rotor and high DF. Strong EpC terminates reentry through self-attenuation\, while moderate EpC terminates reentry through self-collision. Additionally\, strong EpC markedly alters ionic concentrations in the cleft\, significantly increasing [K+]\, nearly depleting [Ca2+]\, and causing moderate changes in [Na+]. This multidomain electrodiffusion model thus provides new insights into the mechanisms of EpC in the heart.\n\nContact: Trachette Jackson UID:135811-21877294@events.umich.edu URL:https://events.umich.edu/event/135811 CLASS:PUBLIC STATUS:CONFIRMED CATEGORIES:Mathematics LOCATION:East Hall - 1084 CONTACT: END:VEVENT BEGIN:VEVENT DTSTAMP:20260105T110419 DTSTART;TZID=America/Detroit:20251017T150000 DTEND;TZID=America/Detroit:20251017T160000 SUMMARY:Social / Informal Gathering:Sustainability Coffee Chats: Free coffee and good conversation! DESCRIPTION:The Student Sustainability Coalition will be hosting our coffee chats throughout the semester and we want you to join us! Passionate about sustainability?--water conservation\, AI\, carbon neutrality\, transportation\, ANYTHING!--come chat with us\, share your passion(s) and interests\, all while helping contribute to a more sustainable University of Michigan! Not to mention: WE WILL BUY YOUR DRINK!\n\nFind us at: \nMaizes Cafe every Friday from 3-4p and Rooting for Change Cafe (3rd Floor Palmer Commons) every other Wednesday from 5-6p UID:138091-21881928@events.umich.edu URL:https://events.umich.edu/event/138091 CLASS:PUBLIC STATUS:CONFIRMED CATEGORIES:Food,Graduate and Professional Students,Free Food,Free,food and the environment,Discussion,Climate Change,Activism,Student Org,Undergraduate Students,Talk,Sustainability,Social Impact,Social,In Person LOCATION:Michigan League - Maizie's Cafe CONTACT: END:VEVENT BEGIN:VEVENT DTSTAMP:20251014T135555 DTSTART;TZID=America/Detroit:20251017T150000 DTEND;TZID=America/Detroit:20251017T160000 SUMMARY:Workshop / Seminar:Tropical linear series and matroids DESCRIPTION:I will present a theory of linear series on tropical curves that balances two notions of rank: the Baker-Norine rank from the tropical Riemann-Roch theorem and another idea of rank based on tropical independence. The resulting theory is surprisingly closely related to matroids. Every tropical linear series contains an open dense subset of nondegenerate divisors in a neighborhood of which the tropical linear series of dimension r is locally isomorphic to the Bergman fan of a matroid of rank r + 1. Moreover\, every matroid appears as such a local matroid of a tropical linear series at a nondegenerate divisor. For instance\, cographic matroids appear as local matroids of canonical linear series at the canonical divisor.\n\nBased on joint work with Chih-Wei Chang\, Matthew Dupraz\, Hernán Iriarte\, David Jensen\, Dagan Karp\, and Jayden Wang. https://arxiv.org/abs/2508.20062 UID:138846-21884065@events.umich.edu URL:https://events.umich.edu/event/138846 CLASS:PUBLIC STATUS:CONFIRMED CATEGORIES:Mathematics LOCATION:East Hall - 4096 CONTACT: END:VEVENT BEGIN:VEVENT DTSTAMP:20251101T123153 DTSTART;TZID=America/Detroit:20251017T150000 DTEND;TZID=America/Detroit:20251017T160000 SUMMARY:Careers / Jobs:UMD Criminology & Criminal Justice Graduate Program Info Session Virtual DESCRIPTION:Are you ready to take the next step in your academic journey? We invite you to join one of our upcoming information sessions to learnmore about the Master's and Doctoral Programs in the Criminology and Criminal Justice Department!During this session\, you will havethe opportunity to:\nDiscover the unique features ofour graduate program\nMeet our faculty and current students\nGet insights on the application process and financial aid options\nAsk any questions you may have\nWhether you’re considering applying or just curious about what we offer\, this session is designed to provide you with all the information you need. We look forward toseeing you there and helping you explore the exciting opportunities that await you in our graduate program!Questions? Email us at criminologydept@umd.edu.An in-person version of this info session will take place on Thursday\, October 16th\, 5pm-6pm EST. Registration for both sessions is available through https://docs.google.com/forms/d/e/1FAIpQLSdkGn392yxI6I9I_B5i8-T9PGVh1jQc6W3eH389ICLTo3la8g/viewform?usp=sharing&\;ouid=100482856599688918836 UID:140353-21886974@events.umich.edu URL:https://events.umich.edu/event/140353 CLASS:PUBLIC STATUS:CONFIRMED CATEGORIES: LOCATION: CONTACT: END:VEVENT END:VCALENDAR