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 30 for “"Dragonfly."”.
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Flight of the Dragonfly
Novel
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Neuronal encoding of natural imagery in dragonfly motion pathways
… Among insects, aerial predators such as the dragonfly face additional survival tasks. Not only must aerial predators successfully navigate three-dimensional visual environments, they must also be able to identify and track their prey. This task is made even more difficult due to the …
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The Dragonfly Fauna (Odonata:Anisoptera) of a Lentic Habitat in Southwestern Missouri
The adult and larval species of dragonflies found within an area known as Durst Park were collected and studies. The study area consisted of two adjacent ponds (together measuring 1.39 ha), nearby fields, and a flowing stream. Descriptions were made of the adult male, adult female, and larval form …
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Design and Kinematics of a Dielectric Elastomer Actuated Micro Dragonfly Robot
… more about their flapping motion. An at-scale dragonfly robot is designed around Dielectric Elastomer Actuators that compress and expand 0.5mm. With this knowledge, MATLAB was used to predict the linkage sizes that control the wing stroke movement. Using the values calculated in MATLAB, …
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Design and prototype of a hovering ornithopter based on dragonfly flight
… in stroke plane is advantageous for the dragonfly. By adjusting the initial angle of attack of the ornithopter's wings, we can artificially recreate varying stroke planes. A comparison of the resultant lift generated from different stroke planes showed that greater lift forces were …
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Early Instar Growth and Survivorship in the Common Baskettail Dragonfly <em>Epitheca cynosura</em> (Anisoptera: Corduliidae).
<p>Egg masses of <em>Epitheca cynosura</em> were collected from Bays Mountain Park, Tennessee, USA, in June, 1999. Newly hatched individuals were placed into enclosures and sampled at scheduled time intervals throughout the summer. Enclosures were exposed to combinations of high and low densities …
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Design of a flapping mechanism for reproducing the motions at the base of a dragonfly wing
… that insects have. The flight of the dragonfly has been chosen to be modeled because of its exceptional flight capabilities. This thesis addresses the flapping mechanism designed for the root of each wing. The prototype of the mechanism, built at a scale of four times the size of a …
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Gregarine parasitism in dragonfly populations of Central Texas with an assessment of fitness costs in Erythemis simplicicollis.
Dragonfly parasites are widespread and frequently include gregarines (Phylum Apicomplexa) in the gut of the host. Gregarines are ubiquitous protozoan parasites that infect arthropods worldwide. More than 1,600 gregarine species have been described, but only a small percentage of invertebrates have …
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Perch Selection by Male Dragonflies (Odonata, Anisoptera) Related to Competitive Ability and Species Composition
… ability. Four hypotheses were tested: 1) Dragonfly species would vary by size and that territorial species would show sexual size dimorphism (SSD), 2) Perch height selection would be related to dragonfly size, 3) Position on the perch would be related to male size, with larger males …
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Dynamic Mechanical Properties of Cockroach(Periplaneta americana) Resilin
… that cockroach resilin is less resilient than dragonfly resilin at low frequencies, returning about 79% of the elastic strain energy at 25 Hz compared to 97% for dragonfly resilin. However, at the glass transition (200 kHz) the material returns about 47% of the elastic strain energy compared to …
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Shadow of dew drops for piano trio
… lotus sprout appears above the water, quickly, a dragonfly lands on it. In this poetry, the mouth of a spring, a little streamlet, the shade of a tree, a sprout of lotus and a lovely dragonfly, they all have lives and feelings just like human beings. The piano trio is a suitable instrumentation to …
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The Effects of Odonates on a Littoral Prey Community
… prey community and absence or presence of dragonfly or damselfly larvae. Prey organisms were sampled with duplicated samples once a week. Statistical analyses indicated a lack of significant predator effects on both the the density and population dynamics of prey whereas replicated …
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Studies on the Odonata and Trichoptera of high-elevation lakes of northern Colorado and southern Wyoming
… occurrence records of the Hudsonian Emerald dragonfly (Somatochlora hudsonica, HED) in Northcentral Colorado and Southern Wyoming. The HED is the only Colorado dragonfly listed as threatened by the US Forest Service. It was ranked as critically imperiled in Colorado and vulnerable in Wyoming. …
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Possible Effects Of Climate Change On Induced Defenses In Tadpoles
… For example, important pond predators, such as dragonfly nymphs, may emerge from ponds in the autumn instead of overwintering in the pond. Amphibians are important components of temporary pond systems, and their tadpoles can exhibit a great amount of plasticity in morphology and life history …
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Optimization of communication intensive applications on HPC networks
… on practical installations of torus and dragonfly networks. Next, use of supervised learning algorithms for conducting diagnostic studies of how communication evolves on networks is explored. Finally, efficacy of packet-level simulations for prediction-based studies of communication …
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