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Articles 16561 - 16590 of 59552
Full-Text Articles in Earth Sciences
Mgrre_Thinsections_Mgrre-78a_6, Mgrre
Mgrre_Thinsections_Mgrre-78a_7, Mgrre
Mgrre_Thinsections_Mgrre-78a_1, Mgrre
Mgrre_Thinsections_Mgrre-78a_8, Mgrre
Mgrre_Thinsections_Mgrre-78a_10, Mgrre
Mgrre_Thinsections_Mgrre-78a_11, Mgrre
Mgrre_Thinsections_Mgrre-78a_12, Mgrre
Mgrre_Thinsections_Mgrre-78a_13, Mgrre
Mgrre_Thinsections_Mgrre-78a_14, Mgrre
Mgrre_Thinsections_Mgrre-78a_16, Mgrre
Mgrre_Thinsections_Mgrre-78a_18, Mgrre
Mgrre_Thinsections_Mgrre-78a_20, Mgrre
Mgrre_Thinsections_Mgrre-78a_22, Mgrre
Mgrre_Thinsections_Mgrre-78a_24, Mgrre
Mgrre_Thinsections_Mgrre-78a_15, Mgrre
Mgrre_Thinsections_Mgrre-78a_16, Mgrre
Mgrre_Thinsections_Mgrre-78a_5, Mgrre
Mgrre_Thinsections_Mgrre-78a_23, Mgrre
Mgrre_Thinsections_Mgrre-78a_25, Mgrre
Mgrre_Thinsections_Mgrre-78a_2, Mgrre
Mgrre_Thinsections_Mgrre-78a_9, Mgrre
Mgrre_Thinsections_Mgrre-78a_21, Mgrre
Mgrre_Thinsections_Mgrre-78a_9, Mgrre
Mgrre_Thinsections_Mgrre-78a_13, Mgrre
Baseflow And Water Resilience Variability In Two Water Management Units In Southeastern Brazil, Lucas Vituri Santarosa, Didier Gastmans, Troy E. Gilmore, Jan Boll, Sebastian Balbin Betancur, Vitor Fidelis Monteiro Gonçalves
Baseflow And Water Resilience Variability In Two Water Management Units In Southeastern Brazil, Lucas Vituri Santarosa, Didier Gastmans, Troy E. Gilmore, Jan Boll, Sebastian Balbin Betancur, Vitor Fidelis Monteiro Gonçalves
Conservation and Survey Division: Faculty and Staff Publications
Changes in climate and water demand in densely populated regions increasingly affect hydrological systems, and, in turn, impact socioeconomic conditions. In this case study, we identify how the hydrogeological frameworks of two water resource management units, Tietê-Jacaré (TJ) and Piracicaba-Capivari-Jundiaí (PCJ) in Sao Paulo state (Brazil), control the baseflow processes and resilience in the face of streamflow fluctuations in response to anthropogenic activities and climate variation. The results reveal between 40% and 75% contributions of baseflow to total streamflow in basins overlying crystalline and sedimentary aquifers. The basins in PCJ which mostly overly crystalline aquifers, have shorter water residence times …
Spatial And Seasonal Variations Of Microplastic Concentrations In Portland's Freshwater Ecosystems, Rebecca Talbot
Spatial And Seasonal Variations Of Microplastic Concentrations In Portland's Freshwater Ecosystems, Rebecca Talbot
Dissertations and Theses
Microplastics are a pollutant of growing concern and are ubiquitous in a variety of environmental compartments. The majority of microplastics research to date has been conducted in marine waters, and less is known regarding the sources and delivery pathways of microplastics in urban rivers. The first chapter is comprised of a review of the scientific literature regarding the spatial and temporal factors affecting global freshwater microplastic distributions and abundances. Microplastic spatial distributions are heavily influenced by anthropogenic factors, with higher concentrations reported in regions characterized by urban land cover, high population density, and wastewater treatment plant effluent. Temporal variables of …
Application Of Gravity Data For Hydrocarbon Exploration Using Machine Learning Assisted Workflow, Oluwafemi Temidayo Alaofin
Application Of Gravity Data For Hydrocarbon Exploration Using Machine Learning Assisted Workflow, Oluwafemi Temidayo Alaofin
LSU Master's Theses
Gravity survey has played an essential role in many geoscience fields ever since it was conducted, especially as an early screening tool for subsurface hydrocarbon exploration. With continued improvement in data processing techniques and gravity survey accuracy, in-depth gravity anomaly studies, such as characterization of Bouguer and isostatic residual anomalies, have the potential to delineate prolific regional structures and hydrocarbon basins. In this study, we focus on developing a cost-effective, quick, and computationally efficient screening tool for hydrocarbon exploration using gravity data employing machine learning techniques. Since land-based gravity surveys are often expensive and difficult to obtain in remote places, …
Crop Rotational Complexity Affects Plant-Soil Nitrogen Cycling During Water Deficit, Timothy M. Bowles, Andrea Jilling, Karen Moran-Rivera, Jorg Schnecker, A. Stuart Grandy
Crop Rotational Complexity Affects Plant-Soil Nitrogen Cycling During Water Deficit, Timothy M. Bowles, Andrea Jilling, Karen Moran-Rivera, Jorg Schnecker, A. Stuart Grandy
Faculty Publications
One of the biggest environmental challenges facing agriculture is how to both supply and retain nitrogen (N), especially as precipitation becomes more variable with climate change. We used a greenhouse experiment to assess how contrasting histories of crop rotational complexity affect plant-soil-microbe interactions that govern N processes, including during water stress. With higher levels of carbon and N cycling hydrolytic enzymes, higher mineral-associated organic matter N concentrations, and an altered microbial community, soils from the most complex rotation enabled 80% more corn N uptake under two moisture regimes, compared to soil from monoculture corn. Higher levels of plant N likely …
Seasonality And Grazing Management Effect On Growth And Nutritional Composition Of Herbage On Semi-Natural Grasslands Grazed By Dairy Cows In Southwest Germany, E. Velasco, S. Perdana-Decker, J. Werner, U. Dickhoefer
Seasonality And Grazing Management Effect On Growth And Nutritional Composition Of Herbage On Semi-Natural Grasslands Grazed By Dairy Cows In Southwest Germany, E. Velasco, S. Perdana-Decker, J. Werner, U. Dickhoefer
IGC Proceedings (1977-2023)
Natural and semi-natural grasslands represent an attractive forage source for cows in organic dairy farming. Throughout the grazing season, however, diverse factors such as climatic conditions, botanical composition, as well as grazing and herd management, can influence growth and nutritive value of forage on grasslands. We aimed at investigating the influence of seasonality and grazing management in forage growth and nutritional quality in seven commercial organic dairy cattle farms during the grazing season 2019 in South Germany. Therefore, forty exclusion cages (1 m2) were installed on pastures, which were under three different grazing systems: rotational, short-grass, and continuous …
Effect Of Cutting Stage And Turning Frequency On Nutritive Value And Digestibility Of Two Tropical Forages, M. M. Chiphwanya, F. C. Chigwa, H. D. C. Msiska
Effect Of Cutting Stage And Turning Frequency On Nutritive Value And Digestibility Of Two Tropical Forages, M. M. Chiphwanya, F. C. Chigwa, H. D. C. Msiska
IGC Proceedings (1977-2023)
In Malawi, feed shortage during the dry season (June-October) is a critical factor affecting smallholder dairying. Though suitable improved forages were long introduced, important parameters that indicate forage and hay quality for dry season feeding have been less well studied. This study evaluated the effect of cutting stage and turning frequency at drying of two tropical forages on nutrient composition and digestibility. A 23 factorial experiment laid out in Randomized Complete Block Design was conducted in Mzuzu milk shed area. Centrosema pubescens and Chloris gayana were established on four plots (5m x 3m) each by 24 dairy farmers; two …