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 18 of 18 for “"Fluttering"”.
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Information Processing in the Auditory Thalamus of the Echolocating Bat, Myotis Lucifugus: Implications for Fluttering Target Detection
The inability of the auditory system to process temporal cues can lead to deficits in speech recognition that can ultimately lead to learning and/or behavioral disorders. Therefore it is important to understand the mechanisms by which the auditory system processes time-varying signals. Echolocating …
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Effects of temperature on gular fluttering and evaporative water loss in four sympatric cormorants in southern Africa
… water loss. This study examined gular fluttering behaviour of four species of southern African cormorants, crowned ( Microcarbo coronatus ), Cape ( Phalacrocorax capensis ), bank ( Phalacrocorax neglectus ), and white-breasted ( Phalacrocorax carbolucidus) cormorants. Results show that …
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Unsteady aerodynamics of falling plates
… In agreement with previous experiments, we find fluttering (side to side oscillations), tumbling (end over end rotation), and apparently chaotic motion. We explore further the transition region between fluttering and tumbling using both direct numerical solutions and the ODE model. In particular, …
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Great Blue Heron Nesting Biology and Habitat Use On the James River in South Dakota
… at the nest, standing on branches, and gular fluttering increased as nestlings matured, while the inactive behavior and not visible categories decreased. Gular fluttering by nestlings and ambient temperature were significantly correlated. Important feeding habitats of adult herons included the …
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The endangered bank cormorant Phalacrocorax neglectus: the heat is on : understanding the effect of climate change and associated environmental variable changes on the breeding biology and population dynamics of the bank cormorant in the W. C., S. A
… Bank cormorants were shown to start gular fluttering at 21°C on average and spend all their time gular fluttering when they experienced an operative temperature of 34.2°C or higher. The birds also started employing this thermoregulatory behaviour at a lower temperature when on eggs or small …
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Walking Toronto's Red Road: The Story Pathways of Indigenous Social Workers
… really all about me, anyways,’ Trickster says, fluttering his eyelashes, resting one hand on his chest. ‘I mean, sure, I suppose we are traveling the story pathways of Indigenous social workers in Toronto,’ he muses, lifting his hand to his chin. ‘But social work in North America is a dynamic …
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Active Nonlinear Vibration Control of Engineering Structures of Multiple Dimensions
… system (MEMS) beam and a fluttering beam. After that, corresponding to the attentions paid to the axially translating materials, the control strategy is applied in the nonlinear vibration control of four typical axially moving structures. Applications of the proposed …
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Two and three-dimensional incompressible and compressible viscous fluctuations
… a helicopter rotor or a turbine cascade or in a fluttering airfoil as well as in a variety of bioengineering problems. The present dissertation is a unified attempt to study some special classes of unsteady two- and three-dimensional incompressible and compressible . boundary-layer flows. The …
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Two libraries
… and shadow on simple concrete walls and on the fluttering leaves and branches of a tree. It is hoped that by withdrawing the visitor from the city and reminding him of his peculiar relation to nature he may renew his awareness of the human condition.
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Investigation Into Flutter of Complex Vane Packs
… for manufacture. They both successfully avoided fluttering in flutter tests and were found to accurately replicate the goal swirl profile when measured with a 5 hole probe. These results provide a basis for understanding and predicting flutter in StreamVanes.
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Performance evaluation of mechanically attached roofing systems
… of the investigated table width. In MAS, the fluttering or "billowing" action of the membrane draws air in to system, thereby affecting system's wind uplift performance. There is no standard specification or test method available to quantify the air leakage rate. By designing an experimental …
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Dynamic Instabilities in Structures with Nonholonomic Constraints
… However, when in the dynamic regime, the fluttering which is brought on by the Hopf bifurcation, interacts with the movement of the plate leading to a self-induced resonance phenomenon. When the frequency of the self-induced vibrations arising from a Hopf bifurcation approaches the natural …
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Effects of Interfaces and Interactions between Multiphase Flow and Solid on Engineering Structures
… effect on mobilizing the oil slug. The fluttering and oscillation of a panel structure is studied to investigate fluid-structure interactions and their effects on the structure. The interactions between fluid and structure are incorporated into the governing equations. A new approach …
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Stability of fluid-loaded structures
… opposed to a "modal superposition"-- view of the fluttering plate problem. First, we derive the energy balance relations for the extended plate (i.e., plate with two sided flow, spring foundation and plate pretension) and define a generalized wave impedance valid for both positive energy waves …
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On the dynamics of rigid and flexible structures under complex flows
… mode is characterized by small-amplitude, planar fluttering-like motions occurring under a critical Cauchy number, $Ca=Ca_c$. Past this condition, the motions were dominated by the second mode consisting on unsteady twisting superimposed to the fluttering patterns. The onset of this mode was …
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Piezoelectric Control of Structures Prone to Instabilities
… were investigated for the panel subject to fluttering instability. The first is the direct negative velocity feedback control using a single gain factor for each of the sets of plate patches and stiffener patches respectively. A systematic method of determining the gains for the patches has …
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Variation in wing area and prey detection volume of Rhinolophus Capensis in response to different climates
… and Doppler shift compensation to detect the fluttering wings of insect prey in dense vegetation. However, the flexibility of these pulses is limited by the bat's acoustic fovea. Wing shape and echolocation combined form an adaptive complex, providing bats with a highly specialized system of …
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Nanoparticle-based Organic Energy Storage with Harvesting Systems
A new form of organic energy storage devices (organic capacitors) is presented in the first part of this dissertation. The storage devices are made out of an organic semiconductor material and charge storage elements from synthesized nanoparticles. The semiconducting polymer is obtained by blending …