{ "135810-21877293": { "datetime_modified":"20251002T165157", "datetime_start":"20251010T150000", "datetime_end":"20251010T160000", "has_end_time":1, "date_start":"2025-10-10", "date_end":"2025-10-10", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"AIM Seminar: Dispersive behaviour of quasilinear hyperbolic waves on periodic backgrounds", "occurrence_title":"", "combined_title":"AIM Seminar: Dispersive behaviour of quasilinear hyperbolic waves on periodic backgrounds: Giovanni Russo (Universit\u00e0 di Catania and University of Michigan)", "event_subtitle":"Giovanni Russo (Universit\u00e0 di Catania and University of Michigan)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: Waves propagating in media with periodic structures have attracted a lot of attention in recent years. These media show interesting macroscopic properties, which may be quite different from those of the individual materials constituting the stratified system. More recently, waves on fluids and gases with an underlying periodic structure have been studied. These waves present a peculiar, somehow unexpected, behaviour. For example, there is evidence that in spite of the fact that the waves are governed by a genuinely quasi-linear hyperbolic system, they do not break into a shock. Here we present several systems in which hyperbolic waves show a dispersive behaviour, and deduce approximate effective equations which explain the peculiar phenomena. In all cases, the effective equations are obtained by asymptotic expansion of the solution in a small parameter representing the ratio between the period of the structure and a typical wavelength.\r\n\r\nWe start by considering 1D shallow water system with periodic bathymetry. The detailed numerical solutions of the system are compared with the ones satisfied by the effective equations at various orders in the small parameter. Traveling wave solutions of the dispersive models are also computed and compared with the traveling waves emerging from the shallow water system. As a second example we consider 2D shallow water, with waves propagating in the x-direction, while the bathymetry is periodic in the y-direction. The last example concerns the Euler equations in gas dynamics. The stationary background is a state with constant pressure, zero velocity, and a periodic variation in the density. Open problems and related work in progress will be mentioned. \r\n\r\nContact: Peter Miller", "occurrence_notes":null, "guid":"135810-21877293@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/135810", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1084", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Applied Interdisciplinary Mathematics (AIM) Seminar - Department of Mathematics", "group_id":"4882", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "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":1, "first_occurrence":21877293 } , "135598-21876979": { "datetime_modified":"20250828T123027", "datetime_start":"20251010T150000", "datetime_end":"20251010T163000", "has_end_time":1, "date_start":"2025-10-10", "date_end":"2025-10-10", "time_start":"15:00:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Bananapocalypse: Un\/Making Plantation Capitalism", "occurrence_title":"", "combined_title":"Bananapocalypse: Un\/Making Plantation Capitalism: U-M Anthropology 2025 Roy A. Rappaport Lecture Series with Assistant Professor Alyssa Paredes", "event_subtitle":"U-M Anthropology 2025 Roy A. Rappaport Lecture Series with Assistant Professor Alyssa Paredes", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"The University of Michigan Department of Anthropology presents its fall 2025 Roy A. Rappaport Lecture Series, \u201cBananapocalypse: Un\/Making Plantation Capitalism,\u201d with Assistant Professor Alyssa Paredes:\r\n\r\n\u201cExistential crises hang over the producers of the world\u2019s food. Many of these challenges are self-inflicted. In the banana-growing regions of the Southern Philippines, which produce fruit for export to Japanese markets, plantations unleash pesticide drift, food waste, water effluent, and fungal pathogens into the surroundings. The plantocratic elite systematically shirks responsibility for these excesses, using legal contracts, scientific conventions, and standards of trade to frame them as \u201cexternal\u201d to their supply chains. However, plantation management is regularly proven wrong in its assumption that the things they try to push downstream will not double back to haunt them. Everyday actors on the plantations\u2019 peripheries transform the devices designed to work against them into openings for intervention. Their efforts implore critical scholars of the environment and of global economies to take seriously the possibility that Big Ag\u2019s increasingly frequent failures to reproduce itself are more than just minor inconveniences to business-as-usual. In this series of lectures, I trace the afterlives of the externalities that commodity production obscures, disguises, or otherwise erases from its ambit of accountability. In so doing, I offer an ethnographic model for turning the commodity studies model, inherited from generations of anthropologists, inside-out.\u201d\r\n\r\nRappaport lectures will take place on the following fall Fridays from 3 to 4:30 p.m. in 411 West Hall. They are free and open to the public. \r\n\r\nFriday, Sept. 12\r\nElses and Externalities: The Un\/Making of Plantation Capitalism \r\n\r\nFriday, Oct. 10\r\nRejects: Food Cosmetic Standards and the Geopolitics of Waste\r\n\r\nFriday, Nov. 14\r\nEffluent: Living Downstream of Yourself on the Mindanao River\r\n\r\nFriday, Dec. 5\r\nForce Majeure: The See-Through Plantation\r\n\r\nVIRTUAL PARTICIPATION LINK: https:\/\/umich.zoom.us\/j\/91475190155\r\n\r\nIf you need accommodations in order to attend, please email anthro.exec.secretary@umich.edu.\r\n\r\nABOUT ASSISTANT PROFESSOR ALYSSA PAREDES\r\nAlyssa Paredes is an environmental and economic anthropologist with research interests at the intersection of industrial agriculture, transnational supply chains, and social mobilization between the Southern Philippines and Japan. Her book manuscript, tentatively titled \u201cBananapocalypse: An Ethnography of the Commodity for the 21st Century,\u201d is under contract with the University of California Press. Additionally, her work appears in journals in anthropology, history, geography, food studies, and Asian studies. She is also co-editor of \u201cHalo-Halo Ecologies: The Emergent Environments Behind Filipino Food\u201d (University of Hawaii Press 2025). She holds a Ph.D. in Anthropology from Yale University.", "occurrence_notes":null, "guid":"135598-21876979@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/135598", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"411", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Anthropology","AEM Featured","Archaeology","Ecology","Environment","History","Southeast Asia"], "website":"https:\/\/lsa.umich.edu\/anthro", "sponsors":[ { "group_name":"Department of Anthropology", "group_id":"3469", "website":"https:\/\/lsa.umich.edu\/anthro" }, { "group_name":"Center for Southeast Asian Studies", "group_id":"1044", "website":"http:\/\/www.ii.umich.edu\/cseas" }, { "group_name":"Museum of Anthropological Archaeology", "group_id":"3760", "website":"" }, { "group_name":"Archaeology at Michigan", "group_id":"5160", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/08\/event_135598_original-2.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/08\/crop-event_135598_original-2.png" }, "occurrence_count":4, "first_occurrence":21876978 } }