Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Field management"”.
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Nitrous oxide from denitrification: Influence of field management, environmental conditions, and nutrient availability
… environmental issue, there is a need to explore managements and conditions that minimize N2O emissions from agricultural systems. My work combined field, lab, and modeling techniques to decrease agricultural N2O emissions. First, I aimed to understand how field management and environmental …
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Evaluation of switchgrass, M. x giganteus, and sorghum as biomass crops: effects of environment and field management practices
… in different environments under different crop management practices, particularly nitrogen (N) fertilizer rates. Chapter 1 provides the rationale of this research and a general discussion of the unique characteristics of these three crops. In Chapter 2, an extensive database of switchgrass …
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Balancing water quality, nitrogen management, and corn production goals in Illinois
… were to (i) evaluate the effectiveness of in-field recommended management practices for improving water quality while also assessing potential agronomic and environmental tradeoffs of those practices, and (ii) explore how process-based modeling tools could be used as an integrative approach …
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Evaluation of the UAV-Based Multispectral Imagery and Its Application for Crop Intra-Field Nitrogen Monitoring and Yield Prediction in Ontario
… predicted using the UAV-based imagery. The intra-field nitrogen prediction model performs well at wheat early growth stage. Additionally, the best data collection time for yield prediction is at the end of booting stage. The results demonstrate the UAV-based data could be an alternative effective …
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Influence of nitrogen rate, harvest frequency, lower leaf management, and chemical topping on mammoth cultivars of flue-cured tobacco
… not flower under normal production conditions. A field management system must be devised for these cultivars to optimize agronomic traits and chemical constituents of the cured leaf. Field experiments were conducted at the Southern Piedmont Agricultural Experiment Station near Blackstone, Virginia …
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Development of vertical bulk gallium nitride power devices
… properties, such as high critical electric field and large bandgap. Despite its superior intrinsic properties, fabrication processes and technology for vertical GaN power electronics is still not as mature as in conventional materials. This thesis covers three aspects of vertical power …
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Development of UAV-based lidar crop height mapping system
… height monitoring is important to appropriate field management. Previous studies have indicated that a Light Detection and Ranging (LiDAR) sensor was capable of accurate and fast data collection. As technology of Unmanned Aerial Vehicles (UAV) advanced, the airborne LiDAR system became a …
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Multi-Kilovolt Gallium Nitride Power Transistors
… primarily from the highly non-uniform electric field (E-field) distribution within the device structure, predisposing the device to premature breakdown and limiting its operational voltage range. Consequently, the quest for higher voltage capabilities in GaN HEMTs requires the fundamental …
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Use Patterns and Influencing Factors of Irrigation Best Management Practices in the Lower Mississippi River Basin
… to document the use of irrigation best management practices (IBMPs), analyze use patterns, and use quantitative methods to determine factors that influence producers’ decisions regarding IBMPs. IBMPs included in the survey can be grouped as: field management practices (zero-grade …
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A descriptive single case study of the female field regional manager experience in automotive aftermarket retail.
… of females employed in-store positions, the field director-level regional manager position remains overwhelmingly male. The purpose of this case study was to explore how the experiences of female field regional managers shaped their perceptions of the social system in a Fortune 300, national, …
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A descriptive single case study of the female field regional manager experience in automotive aftermarket retail.
… of females employed in-store positions, the field director-level regional manager position remains overwhelmingly male. The purpose of this case study was to explore how the experiences of female field regional managers shaped their perceptions of the social system in a Fortune 300, national, …
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Optimum plant density for crowding stress tolerant processing sweet corn in the Upper Midwest
Advances in grain yield of field corn (Zea mays L.) over the last quarter century have been driven in large part by the ability of modern hybrids to better tolerate higher plant densities (i.e., crowding stress) than their predecessors. Yield gains in processing sweet corn, however, pale in …
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Insulation Design and Analysis for Medium-Voltage SiC-based Power Electronics Building Blocks
… detailed. Key considerations, including electric field (E-field) grading near power terminals and PCB edges, cable feedthroughs, and the integration of components, are explored from the perspective of E-field management. A design example of a 3-level dc bus for a 6 kV-1 MW Power Electronics …
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EFFECTS OF ANTHROPOGENIC SELECTION PRESSURE ON THE EVOLUTION OF A COMMON AGRICULTURAL WEED: DOES ADAPTATION COME WITH A DETECTABLE COST? A STUDY OF GLYPHOSATE-RESISTANT (GR) AND -SUSCEPTIBLE (GS) BIOTYPES OF Conyza canadensis
… competition (Chapter 2), and second in a field survivorship study within two habitat types (Chapter 3). The third study tests for the prevalence of GR <italic>C. canadensis</italic> in field margins of GR cropping systems and seeks correlations in the occurrence of resistance and factors …
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EnogisAI: An Artificial Intelligence Framework for Predictive Agronomics
… and adopting agronomic AI solutions in the field. EnogisAI encompasses all the critical aspects of an AI solution development, starting from the data integration processes through model definition, training, and validation to the development of Decision Support Systems (DSSs) for farmers and …
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Seasonal variation, spatial distribution and decision–making system to control of the Leucoptera coffeella in coffee arabica fields
… the L. coffeella population dynamics in the field. Therefore, prior knowledge of the areas and seasons of higher incidence of L. coffeella is essential to field management. The objective of this study was to evaluate the seasonality of the L. coffeella population and the factors that regulate …
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Nitrous oxide emissions under different corn field managements in the United States
… and motivated research efforts to identify field management techniques that best mitigate N2O emissions and reduce these negative environmental impacts. In this study, field N2O emissions were quantified during the 2016 growing season by direct field measurement from corn fields in …
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Biosphere-atmosphere exchange of ammonia from a fertilized corn canopy in Central Illinois
… new measured NH3 fluxes through an experimental field campaign in central Illinois, to investigate dependence of NH3 flux on environmental conditions and field management practices, and to evaluate closure of field measurements and modeled NH3 fluxes. Two experimental field systems to quantify …
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Insulation-Constrained Design of Power Electronics Converters and DC Circuit Breakers
… higher voltages can result in enhanced electric field (E-field) intensities, leaving the system vulnerable to partial discharges (PDs). The manifestation of such PD events gradually degrades the insulation system of the equipment, reducing its lifetime and ultimately leading to total insulation …
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Design, Fabrication, Characterization, and Packaging of Gallium Oxide Power Diodes
… Another benefit is the high critical electric field (Ec), which is estimated to be from 6 MV/cm to 8 MV/cm in Ga2O3. This allows for a superior Baliga's figure of merit (BFOM) of unipolar Ga2O3 power devices, i.e., they potentially can achieve a smaller specific on-resistance (RON,SP) as …
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