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 12 of 12 for “"under-canopy"”.
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A sensor-based obstacle avoidance system for an under-canopy autonomous aircraft
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Millimeter-wave radar dataset for multi-modal fusion and keypoint detection in under-canopy soybean and corn row navigation
… to occlusion and degraded visibility. We a novel under-canopy dataset, collected over two growing seasons in corn and soybean fields, that integrates 77 GHz millimeter-wave (mmWave) radar with RGB-D stereo imagery and inertial measurements under a range of environmental conditions (low light, …
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Factors restricting recruitment of Ascophyllum nodosum L (Le Jolis)
… shore. Juveniles occur high in the zone where canopy is continuous and grazing animals few. Settlement could account for the restricted range if it were enhanced under canopy or on the upper shore. Settlement was monitored under canopy and in the open at four shore levels during spring 1983. …
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Stable isotope analysis as an indicator of tree and grass rooting depth in a mesic African savanna
… from vertical soil profiles in open and under canopy cover and analysed by means of carbon nitrogen isotopes. While δ¹⁵N showed little pattern due to complexities in the fractionation process, δ¹³C revealed that tree and grass rooting depths did not adhere to separate niches as proposed …
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Water and Energy Budgets of Snow-Covered Montane Forests: Observations, Remote Sensing, and Modeling
… is uncertain. This dissertation seeks to understand the interconnection between energy and water budgets to improve hydrological predictions by fusing cutting-edge in-situ and remote sensing observations with energy-budget modeling. We first focus on the impacts of snow models structure on …
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Epidemiological studies on primary inoculum of Venturia inaequalis and V. asperata for apple scab management
… leaves on the ground in dry days, ii) to understand the aerial dispersal of ascospores with the under-canopy irrigation, and iii) to identify the conditions of maturation of pseudothecia and ascospore discharge of V. asperata. The effect of irrigation was evaluated comparing irrigated and …
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Effects of different canopy tree species on belowground biogeochemistry in a wet lowland tropical forest
… and fluxes of belowground resources. Yet, our understanding of the effects of aboveground biogeochemical heterogeneity on belowground ecosystems is poor, especially in the species-rich forests of the wet tropics. To investigate the effects of tree species diversity on belowground biogeochemical …
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Effects of different canopy tree species on belowground biogeochemistry in a wet lowland tropical forest
… and fluxes of belowground resources. Yet, our understanding of the effects of aboveground biogeochemical heterogeneity on belowground ecosystems is poor, especially in the species-rich forests of the wet tropics. To investigate the effects of tree species diversity on belowground biogeochemical …
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Restoration planting options for Pinus flexilis James in the southern Rocky Mountains
… were established at each site, with three plots under areas of high density canopy, and three plots in areas of low density canopy. The following experimental treatments were implemented at each of the six plots: presence/absence of a nurse object and presence/absence of hydrogel. There were six …
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Full season navigation and control of ultra-compact autonomous ag-bot in GPS denied environment
… The system is designed for reliable navigation under cluttered canopies using only a 2-D Hokuyo UST-10LX LiDAR and an RTK GPS as the primary sensors for navigation. Its purpose is to ensure that the robot can navigate through rows of crops without damaging the plants in narrow row-based and …
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Factors influencing seed yield and quality of dwarf French bean (Phaseolus vulgaris L.) in Canterbury
… were determined. In 1996/97 plants were grown under 50 % shade at a population of 82 plants/m² without fertiliser or irrigation (high competition, HC) or without shade at 14 plants/m² with irrigation and fertiliser (low competition, LC). Other treatments were total defoliation or no …
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Biology and conservation status of Juniperus macrocarpa Sm. in Sardinia
… present Ph.D. thesis aimed to provide a better understanding of Juniperus macrocarpa and the habitat that it characterizes (Juniperus spp. habitat; European priority habitat) in Sardinian coastal dunes, as well as to achieve results useful to support in situ and ex situ conservation actions. In …