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 26 for “"buckles"”.
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The Development of a Procedure to Determine the Structural Adequacy Against Buckling of Torispherical and Ellipsoidal Shells Due to Internal Pressure.
… in a catastrophic failure but the presence of buckles does raise questions as to the level of confidence in the safety of the shell of revolution. In addition, buckles may interfere with the function of a pressure vessel. For these reasons, the presence of buckles should be avoided in these …
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Quantifying the effects of an increasingly warmer climate with a view to improving the resilience of Great Britain's railway network: Is a new stressing regime the answer?
… tension cracks and heat-related rail buckles are kept within tolerable levels. It is predicted that winters will become warmer and summers hotter than the baseline climate. It is believed that Great Britain can continue to operate with a stress free (rail) temperature of 27°C under …
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Processive Acceleration of Actin Barbed End Assembly by N-WASP
… filament densities, overlapping filaments formed buckles between their nanofiber tethers and myosin attachment points. These buckles grew 3.4-fold faster than the diffusion-limited rate of unattached barbed ends. N-WASP constructs with and without the native poly-proline (PP) region showed similar …
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Vývoj lyžařské obuvi od počátků lyžování až po současnost
… were made of leather for lacing, then came metal buckles. Another revolutionary change was the use of plastic and synthetic materials. Keywords: alpine ski boots; cross-country ski boots; ski jumping boots; skitouring boots; telemark ski boots; historical development
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Ferroelectricity Coupled To Octahedral Rotations In Perovskite Oxides From First Principles
… exhibit rotations of the oxygen octahedra, which buckles bonds and leads to rich phase diagrams of magnetic and electronic order. This thesis investigates perovskites in which ferroelectricity and octahedral rotations appear together and are strongly coupled. We use first-principles methods and …
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MICROSCOPIC SURFACE ELECTROCHEMICAL ACTUATORS FOR VOLTAGE-TUNABLE OPTICAL ELEMENTS
… fixed boundary condition, the platinum actuator buckles and exhibits maximum out-of-plane displacements on the order of several hundred nanometers with similar further changes in displacement across a mere +/-150mV of applied bias relative to the electrolyte solution. In the visible light range, …
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Modeling and Analysis of a Moving Conductive String in a Magnetic Field
… motion (along a string line) of the string buckles into spiral forms. In the dynamic setting, conditions for stability of certain solutions are presented and discussed. It is shown that there is a divergence between the critical values in the linear dynamic and static cases. Furthermore, …
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Relaxation mechanism in methyl stearate monolayer films at the air/water interface
… constant area: At collapse, the monolayer film buckles and folds over to form bilayer molecular channels (ridges and ribbons). The ridges and ribbons act as a reservoir for monolayer material to make up for lost molecules at the air/water interface due to the growth of a bulk (crystalline) phase …
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Mechanical behavior of elastic rods under constraint
… imposed displacement, the initially straight rod buckles into a sinusoidal mode and eventually undergoes a secondary instability into a helical configuration. The critical buckling loads are quantified and found to depend strongly on the aspect ratio of the rod to pipe diameter. Thirdly, we inject …
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Stability behaviour and dynamic response of cooling towers subjected to wind loading
… pressures/speeds at which the shell first buckles and the corresponding buckling modes. The cooling tower's geometry is changed in a systematic manner to obtain the relationship between critical wind speeds associated with the first mode of buckling and the cooling tower's geometry. …
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Modeling mechanical dynamics in chain-mediated bacterial sliding
… above. In the second dynamic, the chain buckles due to compressive drag forces resulting in the emergence of large curvatures throughout the chain. We devise a continuum mechanics framework to examine the curvature dynamics in the growing chain. Through linear stability analysis of the …
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Buckling at the Fluid - Soft Solid Interface; A Means for Advanced Functionality within Soft Materials
… critical buckling voltage at which the thin film buckles out of the plane is mainly a function of voltage while the shape of deformation and so the functionality of this mechanism depend considerably on the applied boundary conditions. Finally, we enhance the fluid-soft structure response of the …
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The Identification and Comparison of the Flavonoids in the Flowers of Campanula Rapunculoides L. and Campanula Americana L.
The problem. The purpose of this study was to identify and compare the flavonoids found in the flowers of Campanula rapunculoides L. and C. americana L. Procedure. Flavonoids were extracted in 1% HCl-methanol solution and concentrated on a rotary vacuum evaporator. Filter paper chromatography was …
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Floral abundance and soil characteristics affect wild bee community structures and nesting dynamics in tallgrass prairies
Tallgrass prairies have been reduced to less than 5% of their former range, yet provide essential habitats for many native plants and animals such as pollinators. Land managers work to preserve the biodiversity within these tallgrass prairies by implementing management techniques such as burning, …
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Turbulent Separated Flow Over Wavy Surfaces
An experimental investigation of separated flow over wavy surfaces is presented in which laser-Doppler velocimetry is demonstrated to be a useful technique for velocity and turbulence data acquisition. Time-averaged velocity, turbulent intensity, skewness, and flatness data are given.
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Confined wrinkling of thin elastic rods, sheets and cones
… moved towards each other until the sheet buckles further. Cones and frusta are confined immediately without initial buckling. Physical experiments and finite element analyses are used to investigate and observe the confined buckling response, as well as to verify the analytical models …
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Kinetinis šviesos kostiumas "ĮELEKTRINTA" /
… a person by a wide 25 cm leather belt with two buckles. This belt is mounted in the framework which is installed in the polyurethane foam. Engines gain electric stream from mounted accumulators; in the upper part of a dress the light-emitting diodes flare in various effects according to the …
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Study of the compliance and system integration of bistable structures for use as actuation mechanisms in bioinspired adaptive systems
… the compliance of the bistable beam element that buckles as the truss mechanism is compressed increases the bistability of the mechanism and decreases the force required to actuate the mechanism. In addition, adjusting the compliance of the boundary conditions of the bistable element allows for …
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Computational Investigation of Tunable Steel Plate Shear Walls for Improved Seismic Resistance
… The resulting web plate is typically quite thin, buckles at low loads, possesses low stiffness, and does not provide resistance when the lateral loads are reversed until the tension field engages in the opposite direction. To compensate for these shortcomings, moment connections are required at …
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Cellular Morphodynamics Reveals Divergent Mechanisms of Gastrulation in Insects
… genetic factors as an epithelial sheet that buckles inwards, forming a tube that subsequently collapses. While the overall morphogenesis of the mesoderm appears analogous between the two species at the tissue level, the level of conservation of the cellular behaviours driving this process …
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