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Articles 51871 - 51900 of 294719
Full-Text Articles in Physical Sciences and Mathematics
Mgrre_Thinsections_Mgrre-99_9, Mgrre
Mgrre_Thinsections_Mgrre-99_10, Mgrre
Mgrre_Thinsections_Mgrre-99_11, Mgrre
Mgrre_Thinsections_Mgrre-99_12, Mgrre
Mgrre_Thinsections_Mgrre-99_13, Mgrre
Mgrre_Thinsections_Mgrre-100_1, Mgrre
Mgrre_Thinsections_Mgrre-100_2, Mgrre
Mgrre_Thinsections_Mgrre-99_15, Mgrre
Mgrre_Thinsections_Mgrre-100_3, Mgrre
Mgrre_Thinsections_Mgrre-100_4, Mgrre
Mgrre_Thinsections_Mgrre-100_5, Mgrre
Mgrre_Thinsections_Mgrre-100_9, Mgrre
Mgrre_Thinsections_Mgrre-100_10, Mgrre
Mgrre_Thinsections_Mgrre-100_11, Mgrre
Mgrre_Thinsections_Mgrre-100_8, Mgrre
Mgrre_Thinsections_Mgrre-100_12, Mgrre
Macroscale Superdurable Superlubricity Achieved In Lubricant Oil Via Operando Tribochemical Formation Of Fullerene-Like Carbon, Jingjie Pan, Xinxin Gao, Chang Liu, Kan Zhang, Weitao Zheng, Changfeng Chen
Macroscale Superdurable Superlubricity Achieved In Lubricant Oil Via Operando Tribochemical Formation Of Fullerene-Like Carbon, Jingjie Pan, Xinxin Gao, Chang Liu, Kan Zhang, Weitao Zheng, Changfeng Chen
Physics & Astronomy Faculty Research
Friction and wear are ubiquitous in moving mechanical assemblies, causing energy and equipment loss and producing harmful emissions. Mitigation efforts have long relied on oil-based lubricants, but challenges remain in achieving concurrent ultralow friction and wear without oil additives. Here, we demonstrate that a dual-phase TiB2-MoS2 film lubricated by oil without additives exhibits superdurable superlubricity characterized by a vanishingly small friction coefficient (0.007) and ultralow wear rate (10−9 mm3N−1m−1) maintained in lubricants over an unprecedentedly long sliding distance without performance deterioration. We identify a tribochemical route for the decomposition of oil molecules catalytically activated by the TiB2-MoS2 film, leading to …
Soil Microbial Communities Vary In Composition And Functional Strategy Across Soil Aggregate Size Class Regardless Of Tillage, Lukas T. Bernhardt, Richard G. Smith, Andrew S. Grandy, Jessica E. Mackay, Nicholas D. Warren, Kevin M. Geyer, Jessica G. Ernakovich
Soil Microbial Communities Vary In Composition And Functional Strategy Across Soil Aggregate Size Class Regardless Of Tillage, Lukas T. Bernhardt, Richard G. Smith, Andrew S. Grandy, Jessica E. Mackay, Nicholas D. Warren, Kevin M. Geyer, Jessica G. Ernakovich
Faculty Publications
The physicochemical environment within aggregates controls the distribution of carbon and microbial communities in soils. Agricultural management, such as tillage, can disrupt aggregates and the microscale habitat provided to microorganisms, thus altering microbial community dynamics. Categorizing microbial communities into life history strategies with shared functional traits—as has been done to understand plant community structure for decades—can illuminate how the soil physicochemical environment constrains the membership and activity of microbial communities. We conducted an aggregate scale survey of microbial community composition and function through the lens of the yield–acquisition–stress (Y–A–S) tolerator life history framework. Soils collected from a 7-year tillage experiment …
Held At Bay: A Case Study Of A Lake Community’S Effort To Prevent A Zebra Mussel Invasion, Benjamin Breske
Held At Bay: A Case Study Of A Lake Community’S Effort To Prevent A Zebra Mussel Invasion, Benjamin Breske
Department of Environmental Studies: Undergraduate Student Theses
This case study was completed in a lake community in the upper midwestern United States. It seeks to understand the social factors that allowed a lake community to establish an effort to protect against a zebra mussel invasion, as well as the perceptions of the different stakeholders and the steps they took to get the effort going. Rural community action is important for the sustainability of many of the world’s natural resources as these communities are often the first line of defense. Understanding how efforts like this one come together is vital for creating similar efforts elsewhere. I conducted a …
Single-Crystal Elasticity Of Earth’S Mantle Transition Zone Minerals And High Pressure-Temperature Phase Equilibrium Experiments On Martian Basalts, Wenyi Zhou
Earth and Planetary Sciences ETDs
Wadsleyite and ringwoodite are major minerals in the Earth’s Mantle Transition Zone. Global and local seismic studies have detected strong lateral variations in seismic velocity and anisotropy in the Mantle Transition Zone, reflecting temperature and possible composition variations. Interpretation of these seismic observations requires knowledge of thermoelastic properties of wadsleyite and ringwoodite with different compositions (water and Fe contents) under high pressure-temperature conditions. In this dissertation, we have measured single-crystal elastic properties of wadsleyite and ringwoodite under high pressure-temperature conditions by Brillouin spectroscopy. Based on our measurements and previous experimental results, we further model the effects of water and Fe …
Mgrre_Thinsections_Mgrre-98_3, Mgrre
Mgrre_Thinsections_Mgrre-98_7, Mgrre
Mgrre_Thinsections_Mgrre-98_8, Mgrre
Mgrre_Thinsections_Mgrre-93_7, Mgrre
The Significance Of Cephalopod Beaks As A Research Tool: An Update, José C. Xavier, Alexey V. Golikov, José P. Queirós, Catalina Perales-Raya, Rigoberto Rosas-Luis, José Abreu, Giambattista Bello, Paco Bustamante, Juan C. Capaz, Valerie H. Dimkovikj, Angel F. González, Hugo Guímaro, Airam Guerra-Marrero, José N. Gomes-Pereira, Jorge Hernández-Urcera, Tsunemi Kubodera, Vladimir Laptikhovsky, Evgenia Lefkaditou, Fedor Lishchenko
The Significance Of Cephalopod Beaks As A Research Tool: An Update, José C. Xavier, Alexey V. Golikov, José P. Queirós, Catalina Perales-Raya, Rigoberto Rosas-Luis, José Abreu, Giambattista Bello, Paco Bustamante, Juan C. Capaz, Valerie H. Dimkovikj, Angel F. González, Hugo Guímaro, Airam Guerra-Marrero, José N. Gomes-Pereira, Jorge Hernández-Urcera, Tsunemi Kubodera, Vladimir Laptikhovsky, Evgenia Lefkaditou, Fedor Lishchenko
Marine Science
The use of cephalopod beaks in ecological and population dynamics studies has allowed major advances of our knowledge on the role of cephalopods in marine ecosystems in the last 60 years. Since the 1960’s, with the pioneering research by Malcolm Clarke and colleagues, cephalopod beaks (also named jaws or mandibles) have been described to species level and their measurements have been shown to be related to cephalopod body size and mass, which permitted important information to be obtained on numerous biological and ecological aspects of cephalopods in marine ecosystems. In the last decade, a range of new techniques has been …
Mgrre_Thinsections_Mgrre-88_57, Mgrre
Mgrre_Thinsections_Mgrre-88_60, Mgrre
Mgrre_Thinsections_Mgrre-88_76, Mgrre