143258 research outputs found
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Astronomy Day (2025-04-12)
No full textUniversity of Minnesota Duluth. Marshall W. Alworth Planetarium. (2025). Astronomy Day (2025-04-12). Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/272186
A Physiological Perspective on Biodiversity (2025-01-23)
No full textJonathan A. Rader, The University of North Carolina at Chapel Hill; January 23, 2PM, LSci rm 175I am excited to introduce myself to the Department of Biology at the University of Minnesota, Duluth, and to share some of my work pursuing three important questions in evolutionary biology. What are the processes that drive phenotypic evolution? How do individual physiological, morphological, and behavioral traits interact in the broader evolutionary picture? Finally, what are the phenotypic and genetic signatures of ecological specialization? 1 will talk about how the physics of flight has shaped the evolution of wing shape in birds, how evolutionary conservatism in one set of traits can lead us to faulty assumptions about evolutionary divergence among some lineages, and what the evolutionary of ecological specialization among Dmsophila living on a tropical island off the coast of West Africa can teach us about the process of speciation.University of Minnesota Duluth. Department of Biology. (2025). A Physiological Perspective on Biodiversity (2025-01-23). Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/272181
Silha Bulletin Fall 2024
No full textA publication of the Silha Center for the Study of Media Ethics and Law, Hubbard School of Journalism and Mass Communication.A publication of the Silha Center for the Study of Media Ethics and Law, a research center located within the Hubbard School of Journalism and Mass Communication, a part of the College of Liberal Arts at the University of Minnesota, Twin Cities.Silha Center for the Study of Media Ethics and Law; Hubbard School of Journalism and Mass Communication; College of Liberal Arts, University of Minnesota Twin CitiesUniversity of Minnesota: Silha Center for the Study of Media Ethics and Law, Jane E. Kirtley; Levesque, Stuart; Clemmons, Ryan; Lloyd, Alex; Hargrove, Elaine. (2025). Silha Bulletin Fall 2024. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/269371
Minutes: Civil Service Senate: April 3, 2025
No full textUniversity of Minnesota: Civil Service Senate. (2025). Minutes: Civil Service Senate: April 3, 2025. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/272451
Opinion: Uncertainty for DEI programs
No full text30:17Columnists Amelia Watters, Matthew Jegers and Wren Warren-Jacobsen discuss the meaning and importance of DEI initiatives, and their uncertain future under the Trump administration.Watters, Amelia; Jegers, Matthew; Warren-Jacobsen, Wren. (2025). Opinion: Uncertainty for DEI programs. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/272894
Value of Dedicated Right-of-Way: Transit Service Reliability and User Impacts
No full textTransit services connect people to jobs and opportunities, fostering vibrant communities and multimodal travel along service corridors. A transit right-of-way (ROW) can help buses bypass congestion and stay on schedule. Many studies have proved that transit ROWs effectively improve service reliability and reduce user costs. However, these studies often focus on one or two service corridors, limiting comprehensive impact assessment. This project addresses this gap by investigating service reliability for all route segments across a transit system.
We derived reliability metrics at the route segment level using high-resolution automatic vehicle location (AVL) and automatic passenger count (APC) data collected in the Twin Cities metropolitan area. We then collected and integrated data from various sources via spatial-temporal computing to capture service characteristics, operating environments, traffic conditions, and land-use features along route segments. We applied the Gradient Boosting Model (GBM) to examine nonlinear relationships between these factors and bus travel time reliability. Lastly, we used the trained model to estimate potential improvements in reliability with dedicated ROWs. Through these steps, we worked with members of the Technical Advisory Panel (TAP) to illustrate our methodology and demonstrate its utility for transit agencies. Specifically, the results proved that the ratio of bus lanes and busways was associated with more reliable travel time along route segments. We also found that route segments along a few service corridors with unreliable services can greatly benefit from implementing a dedicated ROW.Song, Ying; Zeng, Xiaohuan; Khani, Alireza; Sok, Sahas. (2025). Value of Dedicated Right-of-Way: Transit Service Reliability and User Impacts. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/272858
Commission QT Ice Cream Social (2025-04-10)
No full textUniversity of Minnesota Duluth. Commission QT. (2025). Commission QT Ice Cream Social (2025-04-10). Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/272288
Edward A. Comor's 2025 Book W. T. Easterbrook: Harlod Innis's Final course, and Walter J. Ong's Thought
No full textSee the above abstract.In my 7,000-word review essay "Edward A. Comor's 2025 Book W. T. Easterbrook: Harold Innis's Final Course, and Walter J. Ong's Thought," I first succinctly highlight the pertinent thought of the American Jesuit Renaissance specialist and cultural historian and pioneering media ecology theorist Walter Jackson Ong, Jr. (1912-2003; Ph.D. in English, Harvard University, 1955) of Saint Louis University, the Jesuit university in the City of St. Louis, Missouri (USA). I also succinctly highlight the life and work of the Canadian scholar Harold Adams Innis (1894-1952), who was an intellectual giant at the University of Toronto and who are also a founder of media ecology studies.N/AFarrell, Thomas. (2025). Edward A. Comor's 2025 Book W. T. Easterbrook: Harlod Innis's Final course, and Walter J. Ong's Thought. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/271702
Human and Spatial Influences on Microplastic Accumulation in Minnesota Lakes (2025-03-07)
No full textJoseph Marchand, Master's Student; Friday, March 7th; Chem 200, 3 p.m.; Research Advisor: Dr. Liz MinorMarchand, Joseph; University of Minnesota Duluth. Department of Chemistry and Biochemistry. (2025). Human and Spatial Influences on Microplastic Accumulation in Minnesota Lakes (2025-03-07). Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/272101
Modeling, control, and optimization of autonomous diesel- and electric-powered off-highway vehicles for energy efficiency
No full textUniversity of Minnesota Ph.D. dissertation. February 2025. Major: Mechanical Engineering. Advisor: Zongxuan Sun. 1 computer file (PDF); ix, 85 pages.Off-highway vehicles are heavily relied upon for industrial transportation and havehighly energy-intensive operation. Automation of off-highway vehicles presents an opportunity to reduce energy consumption without negative impact on productivity through optimization. Prior studies on this topic are lacking a systematic formulation of the optimal control problem for automation. This work introduces novel formulations of the optimal control problem for a typical wheel loader drive cycle for both diesel- and electric-powered vehicles. The formulations include development of control-oriented mathematical models, physical constraints, boundary constraints to create the desired cycle, and multi-objective cost functions. Simulations of the optimized trajectories demonstrate feasibility of implementation and allows deeper analysis of proposed reductions in energy. This work finds that optimal automation for a diesel wheel loader can reduce energy consumption by 42.1% while matching or improving that productivity of a human driver. For electric wheel loaders, this work extends the feasibility of electrification to larger sizes than those found in literature while matching diesel per-day productivity with 1.2 battery charges compared to human drivers and 1.8 battery charges compared to an optimal automated diesel vehicle while demonstrating 74% less energy consumption. The diesel-powered vehicle reduces energy by optimizing the engine operation point via coordination of the driving and working systems, while the electric-powered vehicle further reduces energy consumption with a more efficient architecture. Overall, this work demonstrates the potential for automation of off-highway vehicles to reduce energy consumption, provides a systematic methodology for optimizing automation and evaluating its benefits, and gives a pathway to electrification of mid-size wheel loaders using automation.Edson, Connor. (2025). Modeling, control, and optimization of autonomous diesel- and electric-powered off-highway vehicles for energy efficiency. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/271696