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 52 for “"Swimmer"”.
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Modeling and control of a self-assembled robotic swimmer
… on model learning for a self-assembled robotic “swimmer”. The swimmer forms when a liquid suspension of ferro-magnetic micro-particles and a non-magnetic bead are exposed to an alternating magnetic field that is oriented per- pendicular to the liquid surface [1]. It can be steered by modulating …
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Optimizing the stroke of Purcell's rotator, a low Reynolds number swimmer
… rotator is a theoretical low Reynolds number swimmer that can act as a model of more complex natural microorganisms, such as E.coli. Because of the low Reynolds number environment, the swimmer has approximately no inertia and it's motion is dominated by viscous forces. The version of Purcell's …
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Modeling a two-link rigid swimmer scalloping in linear viscoelastic fluid
… number, E.M. Purcell established that a rigid swimmer comprised of two links cannot swim in a viscous Newtonian fluid due to the reciprocal nature of its movements. Viscoelastic fluid, on the other hand, has a characteristic time scale associated with stress relaxation and can impart …
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Design of two-tailed swimmer to swim at low-Reynolds number
… of the Scallop Theorem. Furthermore, a swimmer must employ one of the three mechanisms stated by Purcell to be capable of swimming at low Reynolds number, a three link swimmer, a corkscrew, or a flexible tail. Three devices utilizing the flexible-tail paradigm of swimming were tested …
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Investigating the Effects of Endurance Training on Heart Rate Variability in Female Swimmer Athletes
… changes in HRV and ANS fluctuations in female swimmer athletes throughout an entire collegiate swim season. 9 Division I female swimmers (Age: 20.6±1.01) were used to determine HRV at three different points in their competitive training: pre-season, mid-season, and post-season. During each …
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The contribution of the pectoral fins, body, and the ribbon fin to turning maneuvers of a gymnotiform swimmer
<p>Turning is an ecologically important maneuver in fishes as it is used in prey detection, predator avoidance, and to navigate complex environments. Fishes with traditional control surfaces primarily use body bending and pectoral fins to turn. However, little is known about how fishes with …
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A study of the motion of the three-linked swimmer in viscous fluid using computational and experimental methods
… the mechanics of motion of the three-linked swimmer in viscous fluid. Numerical studies in C++ were used to predict the velocity and motion of the swimmer using a modified analytical model that considers the dynamical and orientational effects of rods at the surface of a fluid. Computational …
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Swimming in slime
… is to study the problem of a low Reynolds number swimmer that is in very close proximity to a wall or solid boundary in a non- Newtonian fluid. We assume that it moves by propagating waves down its length in one direction, creating a thrust and therefore propelling it in the opposite direction. We …
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The dynamics and kinematics of bio-in swimming systems
… visualization framework by studying an idealized swimmer: Purcell's three-link swimmer, at low Reynolds number. This framework allows us to illustrate the complete dynamics of the system, design gaits for motion planning and identify optimal gaits in terms of efficiency and speed. We extend the …
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Motility of Swimming Bacteria Hydrodynamics and Statistics
… govern the dynamics of a low Reynolds number swimmer. We pay special attention to the random walk model for the description of the swimming trajectories, since it allows to quantify motility in terms of statistical measures, such as diffusivity and drift velocity, which can be measured …
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Bio-inspired fluid locomotion
… on a lubrication layer, and the three-link swimmer which moves in an unbounded fluid. Robosnail 1 utilizes lubrication pressures generated in a Newtonian fluid under a steadily undulating foot to propel itself forward. Tractoring force and velocity measurements are in agreement with analytic …
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Motion at low Reynolds number
… address questions regarding locomotion of micro-swimmers, transport of nutrient around micro-organisms as well as mixing and heat exchange inside micro-droplets of water. A general framework for the investigation of optimal locomotion strategies for slender swimmers has been developed and applied …
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So Others May Live: Enhancing Resilience and Performance for United States Coast Guard Helicopter Rescue Swimmer Candidates to Help Close the AST Body-to-Billet Gap
… more commonly known as helicopter rescue swimmers, due to high attrition from the training pipeline. Stretching thin a workforce which operates under some of the worst conditions on the planet is a recipe for injury or even loss of life. Positive and performance psychology offer tools to …
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Aperture: An architecture to amplify aspects of competitive swimming
… that present the extraordinary motion of the swimmer, especially to the younger general public. The focus will be on the motion of swimming below and above the surface of the water. Below the water surface, the approaching swimmer and the moment of the turn will be framed. Above the water …
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Biolocomotion near free surfaces in Stokes flows : mechanism of swimming and optimization
… nonlinear coupling between the motion of the swimmer and the free surface deformations, without putting any limits on the deformation size. These closed-form solutions are then applied to optimization questions. In the high Reynolds number limit, swimming near the free surface is known to …
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Slender elastic swimmers : kinematics, dynamics, and robotic applications
… is to replace the mechanical body of the swimmer with a passive elastic element. In this scenario, the robot uses a single actuator, housed within a rigid forebody, to generate a fish-like propagating wave along a flexible trailing tail. A number of groups have explored this approach, but …
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Propulsion devices for locomotion at low-Reynolds number
… number flows for self propulsion. The three-link swimmer is designed to swim through in a free viscous fluid using cyclic flipping motion of two rigid fins attached to a rigid midsection. Robosnail 1 uses lubrication pressures underneath a flexible, sinusoidally waving boundary to generate thrust, …
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Elastic tail propulsion at low Reynolds number
… of such a propulsive mechanism. A robotic swimmer is constructed and both tail shape and propulsive force are measured. Filament characteristics and the actuation are varied and resulting data are quantitatively compared with existing linear and nonlinear theories.
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Eine Programmtheorie Sozialer Arbeit in der medizinischen Rehabilitation – als Beispiel empirisch-fundierter Theoriearbeit in den Gesundheitswissenschaften
… in der medizinischen Rehabilitation] (SWIMMER project)," while others contribute through additional empirical and conceptual analyses. <br /> PUBLICATION A provides a systematic review of existing evidence on the effectiveness of social work in medical rehabilitation in Germany, the …
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