{ "150321-21909023": { "datetime_modified":"20260921T144502", "datetime_start":"20261009T120000", "datetime_end":"20261009T130000", "has_end_time":1, "date_start":"2026-10-09", "date_end":"2026-10-09", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"NERS Colloquium: Extending Electron Emission Models Beyond Planar, Single Mechanism Devices", "occurrence_title":"", "combined_title":"NERS Colloquium: Extending Electron Emission Models Beyond Planar, Single Mechanism Devices: Allen L. Garner, Purdue University", "event_subtitle":"Allen L. Garner, Purdue University", "event_type":"Presentation", "event_type_id":"16", "description":"Dr. Allen L. Garner, a professor of nuclear engineering at Purdue University and U-M NERS alumnus, will discuss new mathematical approaches to modeling electron emission and current flow in complex geometries. His research explores how different electron emission mechanisms interact with space-charge limitations, offering alternatives to computationally expensive simulations. These models have applications in high-power microwaves, directed energy, radiation devices, and semiconductor manufacturing.\n\nAbstract:\nElectron emission physics is important in high-power microwaves, directed energy, high-power radiation devices, and sheath physics in plasma processing in the semiconductor industry. Electrons may be emitted due to strong electric fields by field emission (FE) or high cathode temperatures by thermal emission (TE). Jensen developed a mathematical framework to link FE, TE, and photoemission. Regardless of source, only so much current may be emitted into a gap. The resulting space-charge-limited current density (SCLCD) was derived over a century ago for a one-dimensional (1D) vacuum planar diode by Child and Langmuir, while Mott and Gurney derived an analogous law for semiconductors three decades later. Extensions to more realistic geometries and intermediate conditions between the Child-Langmuir (CLL) and Mott-Gurney (MGL) laws, as well as FE and TE, are challenging, often requiring detailed and computationally expensive simulations. This seminar describes approaches to model multidimensional, nonplanar geometries with multiple emission mechanisms and apply these models to practical conditions. \nFirst, we summarize geometric approaches to generalize SCLCD calculations. We apply variational calculus (VC) to extremize the current in the gap, conformal mapping of the space-charge electric potential to translate the solution from Cartesian coordinates to the geometry of interest, and Lie point symmetries (i.e., point transformations) to derive exact solutions for multiple 1D geometries. We further derive a universal relationship between vacuum electric potential and space-charge limited potential that yields SCLCD for multidimensional diodes with any geometry and apply it to derive the SCLCD for a tip-to-tip geometry and for arrays of tips, demonstrating reasons for disagreements between theory and particle-in-cell simulations. Since all these approaches depend on electric potential, we demonstrate the importance of the spatial variation of electric potential in a collisional gap and how it relates to the collision frequency. We further demonstrate the utility of these equations to calculate the collision frequency in a gap.\nNext, we describe our application of \u201cnexus\u201d theory to describe the transition between source currents (e.g., FE or TE) and the SCLCD. We combine nexus theory with point transformation to generalize SCLCD and the transitions between the source currents and SCLCD for nonplanar diodes. Using current-voltage curves from molecular dynamics simulations, we demonstrate how to combine nexus theory and charge-free electric potential to calculate emission area for any mechanism and geometry.\n\nBio: \nDr. Allen L. Garner received the B.S. degree (with high honors) in nuclear engineering from the University of Illinois, Urbana-Champaign, in 1996. He received an M.S.E. in nuclear engineering from the University of Michigan in 1997, an M.S. in electrical engineering from Old Dominion University in 2003, and a Ph.D. in nuclear engineering from the University of Michigan in 2006. He was an active duty Naval officer from 1997 to 2003 and is currently a Captain in the United States Navy Reserves. From 2006 to 2012, he was an electromagnetic physicist at GE Global Research Center. He joined the School of Nuclear Engineering at Purdue University in 2012, where he is currently a Professor.\n\nThe NERS Colloquia Series invites leading researchers, industry experts, and thought leaders from across the nuclear engineering and radiological sciences community to share their insights with students, faculty, and guests. Covering a wide range of topics\u2014from cutting-edge research and emerging technologies to policy, education, and professional development\u2014the weekly talks offer an opportunity to explore current issues and innovations shaping the future of the field.", "occurrence_notes":null, "guid":"150321-21909023@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150321", "building_id":"1000403", "building_name":"Cooley Building", "campus_maps_id":"42", "room":"Baer Room (2906 Cooley)", "location_name":"Cooley Building", "has_livestream":0, "cost":"", "tags":["Colloquia","Interdisciplinary","Michigan Engineering","Physics","Research","Science"], "website":"", "sponsors":[ { "group_name":"Nuclear Engineering & Radiological Sciences", "group_id":"4000", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/09\/event_150321_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/09\/event_150321_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21909023 } , "153165-21915219": { "datetime_modified":"20261001T152518", "datetime_start":"20261009T120000", "datetime_end":"20261009T235900", "has_end_time":1, "date_start":"2026-10-09", "date_end":"2026-10-09", "time_start":"12:00:00", "time_end":"23:59:00", "time_zone":"America\/Detroit", "event_title":"SMART CENTER Symposium", "occurrence_title":"", "combined_title":"SMART CENTER Symposium", "event_subtitle":"", "event_type":"Conference \/ Symposium", "event_type_id":"5", "description":"November 10 - 11, 2026\n\nConnect with pioneers and shape the future of single-molecule biology together. The SMBio Single-molecule\nBiology Symposium brings together scientists interested in single-molecule approaches from all over the world to\nshare their research, connect, and exchange ideas and experiences.\n\nJoin us at Kahn Auditorium in the Taubman Biomedical Science Research Building (109 Zina Pitcher Place).\nPlease see https:\/\/www.lumicks.com\/event\/symposium\/smbio-2026-midwest# for the agenda.", "occurrence_notes":null, "guid":"153165-21915219@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/153165", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":null, "has_livestream":0, "cost":"This Symposium requires a registration fee to help make it a fantastic event for everyone. To accommodate a broad variety of people, the pricing model is as follows: PhD student or Postdoc: $75 PI or Industry: $200 The fee allows us to sustainably organize a recurring, high-quality meeting for the single-molecule community and covers breakfast, lunch and costs for the social networking evening for both days. After your registration is confirmed, we will be in touch to provide you with instructions on payment options.", "tags":["Symposium","Research","Molecular","Biology"], "website":"https:\/\/www.lumicks.com\/event\/symposium\/smbio-2026-midwest#", "sponsors":[ { "group_name":"LSA Biophysics", "group_id":"3767", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/10\/event_153165_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/10\/event_153165_original-1.jpg" }, "occurrence_count":42, "first_occurrence":21915211 } , "136347-21908117": { "datetime_modified":"20260914T101238", "datetime_start":"20261009T120000", "datetime_end":"20261009T124500", "has_end_time":1, "date_start":"2026-10-09", "date_end":"2026-10-09", "time_start":"12:00:00", "time_end":"12:45:00", "time_zone":"America\/Detroit", "event_title":"T.REX", "occurrence_title":"", "combined_title":"T.REX", "event_subtitle":"", "event_type":"Film Screening", "event_type_id":"11", "description":"With stunning CGI visuals and the latest research from leading paleontologists, the film offers audiences a fresh perspective on the GOAT (Greatest Of All Tyrants): Tyrannosaurus rex. Anchored by the true story of the young fossil hunters who made the discovery of a lifetime when they spotted a large fossilized leg bone on a walk on public lands in North Dakota, T. REX intercuts the remarkable fossil dig, with cutting edge computer graphics that bring the iconic T. rex to life\u2014from hatchling to hulking adult. Narrated by Jurassic Park actor Sam Neill, T. REX explores the newest science that has helped reinvent our understanding of the iconic predator.", "occurrence_notes":null, "guid":"136347-21908117@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/136347", "building_id":"1005169", "building_name":"Museum of Natural History", "campus_maps_id":"646", "room":"Planetarium & Dome Theater", "location_name":"Museum of Natural History", "has_livestream":0, "cost":"Tickets are $9 and are available in the museum store on the day of the show.", "tags":["Film","Museum","natural history museum","Planetarium"], "website":"https:\/\/lsa.umich.edu\/ummnh\/visitors\/planetarium-dome-theater.html", "sponsors":[ { "group_name":"Planetarium & Dome Theater at the Museum of Natural History", "group_id":"3825", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/07\/event_136347_original-1.jpg", "styled_images":{ 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| Drop-In Tour: Linda Kimmel, Docent", "event_subtitle":"Linda Kimmel, Docent", "event_type":"Tours", "event_type_id":"25", "description":"Looking for something to feed your brain on your lunch hour? The Mid-Day Morsel tour at the Kelsey Museum is a 30-minute taste of ancient Mediterranean history and artifact highlights in the Kelsey collection. Mid-Day Morsel tours begin at 12:30 PM. No registration is needed. Tour participants should gather at our Maynard Street entrance a few minutes before the tour is scheduled to start.\n\nThis event is free and open to all visitors. If you have any questions or concerns regarding accessing this event, please visit our accessibility page at https:\/\/myumi.ch\/zwPkd or contact the education office by calling (734) 647-4167. We ask for advance notice as some accommodations may require more time for the university to arrange.", "occurrence_notes":null, "guid":"152279-21913480@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152279", "building_id":"1000178", "building_name":"Kelsey Museum of Archaeology", "campus_maps_id":"186", "room":"", "location_name":"Kelsey Museum of Archaeology", "has_livestream":0, "cost":"", "tags":["Ancient Egypt","Tour","Museum","History","Free","Archaeology","Ancient Rome","Ancient Middle East","Ancient Greece"], "website":"https:\/\/lsa.umich.edu\/kelsey\/news-events\/all-events.html", "sponsors":[ { "group_name":"Kelsey Museum of Archaeology", "group_id":"3154", "website":"http:\/\/www.lsa.umich.edu\/kelsey\/" }, { "group_name":"Kelsey Museum of Archaeology Tours", "group_id":"3777", "website":"" }, { "group_name":"Archaeology at Michigan", "group_id":"5160", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/09\/event_152279_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/09\/event_152279_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21913480 } , "149491-21906516": { "datetime_modified":"20261003T212122", "datetime_start":"20261009T123000", "datetime_end":"20261009T140000", "has_end_time":1, "date_start":"2026-10-09", "date_end":"2026-10-09", "time_start":"12:30:00", "time_end":"14:00:00", "time_zone":"America\/Detroit", "event_title":"Place as Method, Theory, and Responsibility: Rethinking Scientific Inquiry for Complex Social Issues", "occurrence_title":"Early Career Scholars Lunch \u2014 Problem synthesis \u2014 what gets in the way of better science?", "combined_title":"Place as Method, Theory, and Responsibility: Rethinking Scientific Inquiry for Complex Social Issues: Early Career Scholars Lunch \u2014 Problem synthesis \u2014 what gets in the way of better science?", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The challenge: New data and approaches to study complexity in the social world has often been without a concurrent focus on the foundations of scientific inquiry, including complex thinking, broad causal thinking, attention to epistemic lens, and integrating multiple disciplinary approaches. Further, the academic research model, with its resource-segregated networks, discipline-specific training, and short-term productivity metrics, contributes to a fragmented and potentially misleading understanding of the social world. In the second annual ISR Symposium on Complexity in the Social World, we will use \u2018place\u2019 as the case study to facilitate discussions on rigorous social science in the public interest.Using research on place as the case study, discussion topics will include:Complex thinking about the social worldThe contribution of the humanities the study of the social worldEpistemic lens and research transparencyTheories, frameworks, and the limits of traditional causal inferenceThe draw and danger of cool new dataAddressing the challenges of the academic model of sciencePresentations on the science of place will include:The relational nature of place in population social inequalitiesThe role of history in shaping placeThe racialization of place; the spatialization of racePlace as a neutral and rational driver of social inequalitiesApproaches to testing (causal) ideas around place", "occurrence_notes":null, "guid":"149491-21906516@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149491", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"Room 6050, Institute for Social Research", "has_livestream":0, "cost":"", "tags":["Sessions"], "website":"https:\/\/sessions.studentlife.umich.edu\/p\/track\/17400", "sponsors":[ { "group_name":"Sessions @ Michigan", "group_id":"4791", "website":"https:\/\/sessions.studentlife.umich.edu\/" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":12, "first_occurrence":21906506 } }