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 38 for “"Undulation"”.
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Lateral undulation of a snake-like robot
… propulsive forces. It was found that lateral undulation is highly dependent on the actuator torque output and environmental friction.
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to world-build engulfed within the undulation - withdrawn yet prevalent
Práce se zabývá vývojem procesu tvorby fikčního světa podle předurčených schémat a pravidel, analýzou jeho vznikající interní topologie a následnou prezentací vytvořeného světa divákovi skrze instalaci inspirovanou nelineárními strukturami gamebooků.
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No vacancy: explaining the undulation of office building construction projects in Chicago's central business district during the 1970s
<p>The research endeavors to explain the absence of office building construction projects in Chicago’s Central Business District between 1976 and 1979. Fourteen office building construction projects were completed between 1970 and 1975 but none during the period studied. Using a socio-spatial …
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Physical mechanisms of control of gliding in flying snakes
… stable without any specialized flight surfaces. Undulation is the most prominent behavior of flying snakes and is likely to influence their dynamics and stability. To examine the effects of undulation, a number of theoretical models were used. First, only the longitudinal dynamics were considered …
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A study of the mechanical behavior of a 2-D carbon-carbon composite
… were studied as a function of stacking sequence, undulation aspect ratio, and undulation offset ratio. The results indicated that under out-of-plane loading σ<sub>x</sub> and τ<sub>xz</sub> were strongly dependent on the geometric parameters studied, but σ<sub>z</sub> and σ<sub>y</sub> were …
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The Dynamics of Non-Equilibrium Gliding in Flying Snakes
… airfoil, and undulate through the air. Aerial undulation is the dominant feature of snake flight, but its effects on locomotor performance and stability are unknown. Chapter 2 describes a new non-equilibrium framework to analyze gliding animals and how the pitch angle affects their …
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Synchrotron X-Ray Diffraction and Piezospectroscopy used for the Investigation of Individual Mechanical Effects from Environmental Contaminants and Oxide Layer Undulations in Thermal Barrier Coatings
… the coating. The growth of the TGO manifests as undulations in a series of peaks and troughs. Understanding the mechanics of the oxide layer at these locations provides significant information with respect to the failure mechanisms of the TBC coating. This study investigated the stress at the …
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Optimizing Snake Locomotion on a Plane: A Variational and Analytical Framework for Friction and Normal Force Modulation
… where transverse friction dominates, lateral undulation is both energetically favorable and effective for propulsion. However, in isotropic environments, lateral undulation fails to produce net movement due to symmetry constraints. We extend the framework to analytically derive two additional …
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Numerical Constitutive Models of Woven and Braided Textile Structural Composites
… yarns. The yarn paths are modeled with undulation portions, in which one yarn passes over and under one or more yarns, and with straight portions. It is assumed that the centerline of a yarn in the undulation portions is described by the sine function, and that the cross-sectional area …
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Material properties of skin in a flying snake (Chrysopelea ornata)
… has the ability to glide via lateral aerial undulation and dorsoventral body flattening, a skill unique to this group, but in addition to other functions common to all colubrids. The skin must be extensible enough to allow this body shape alteration and undulation, and strong enough to …
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Voltage programmable diffraction grating device
… operation of the device is to create sinusoidal undulation (wrinkle) on the surface of oil. This wrinkle is used as a variable diffraction grating that changes the wrinkle amplitude in proportion to the applied voltage squared. The device consists of a thin layer (between 8 μm and 50 μm) of …
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INTRACELLULAR PATTERN FORMATION OF F-BAR PROTEIN FBP17
… curvature of F-BAR is crucial for membrane undulation and wave propagation. My results present a biological system where membrane-shape-mediated mechano-chemical feedback is critical for spatiotemporal pattern formation. This curvature-mediated coupling is a novel mechanism for rapid …
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Influence of side walls and undulated topography on viscous gravity-driven film flow
… from the main flow at the lee side of the undulation for kinematic reasons, or induced by inertial effects. In biological systems these eddies are dead water areas, which are cut off from nutrient supply, in heat exchanger applications their appearance has a strong impact on the convective …
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Simulation and theoretical study of swimming and resistive forces within granular media
… experiments. By varying the amplitude of the undulation in the RFT, I found that the range of amplitude used by the animal predicted the optimal swimming speed. I developed a numerical model of the sandfish coupled to a discrete element method simulation of the granular medium to test …
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Investigation of Pin Fin Cooling Channels for Applications in Gas Turbines
… of a biomimicry pin channel created using the undulations observed on seal whiskers also showed improvements in heat transfer levels and reduced pressure drops across the channel. The undulation treatment was applied to an elliptical and cylindrical pin. Preliminary results have shown that the …
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Non-inertial Undulatory Locomotion Across Scales
… few to many appendages rely on waves of undulation for locomotion. In inertial regimes, organisms can leverage the forces generated by their body and the surrounding medium's inertia to enhance their locomotion (e.g., coast or glide). On the other hand, in non-inertial regimes …
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Indentation Behavior of Multilayer Al/SiC Thin Films
… and the relative size of the indenter to the undulation. The amount of equivalent plastic strain in the Al layers also increases in the presence of undulating layers. These multilayer films exhibit interesting and complex mechanical behavior under indentation type loading and unloading. The …
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Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont
… and stream geomorphic complexity (vertical undulation of thalweg, channel sinuosity) as metrics of the potential for hyporheic exchange (hyporheic potential). Our results include bivariate plots that relate urbanization (e.g., total percent impervious) with hyporheic potential at several …
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Quasi-Static and Fatigue Evaluation of Pultruded Vinyl Ester/E-Glass Composites
… to the pultrusion axis had greater fiber undulation and maximum of 44% quasi-static strength reduction and 8% stiffness reduction compared with axially tested specimens. While the matrix failure strain was 1.9%, failure strain of these laminates range over 1.91 to 2.08% when tested along …
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The Topography and Flow of the Antarctic Ice Sheet
… the thin ice of coastal reg ions as surface undulation wav el eng ths decrease and amplitudes increase. Temperature and velocity variations also have significant effects. The coastal zone is punctuated by embayments of severe topography immediately inland of outlet glaciers. This topographic …
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