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 21 for “"Spring Constant"”.
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Cement Stabilized Crushed Stone Base Course Strength and Stiffness Analysis
… of the concrete pavement, with the composite spring constant (kc), which is calculated from subgrade resilient modulus, subbase modulus of elasticity (MOE), and the subbase depth. The ME instead includes material properties such as MOE and Poisson’s ratio, in addition to a large list of other …
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Modified Maxwell Model for hysteresis compensation of piezoelectric stack actuators
… set for later cycles, and the first Maxwell spring constant is related to the input history - input range or local extremum, respectively. Further studies suggested that the linear dependence of the first spring constant on the input range is much stronger than on the local extremum. …
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Replacement of an active metatarsophalangeal joint with a passive spring-damper system for implementation in an ankle prosthesis
… (MTP) joint to be used in a prosthetic ankle. A spring was added to the joint to store energy and release it during the part of the gait cycle where the highest torque is required, reducing the torque the motor must exert. A linear spring-damper system adapted for use on a rotational joint was …
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Experimental and computational study of the mechanics of chikungunya
… performed using AFM force spectroscopy mode. The spring constant of the virus was determined from the force-displacement data for an indentation force between 0.1 and 0.4 nN. The height and spring constant of the virions were considerably larger in the neutral extracellular environment (hᵥ = 57.8 …
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The Correlated Dynamics of Micron-Scale Cantilevers in a Viscous Fluid
… of stiffness ratios, which is the ratio of the spring constant of the tethering relative to the cantilever spring constant, the change in the correlated dynamics of a Hookean spring tethered cantilever pair can be seen in the presence of fluid coupling. The dynamics of a spring-mass tethered, …
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Molecular Mechanisms of Cell Adhesion
… the Ig12/Ig12 complex can behave as a molecular spring of spring constant ∼0.03 N/m in response to forces of tens of pico-Newton. Such tertiary structure elasticity can be expected to be pervasive considering the large number of multi-modular CAMs. Finally, we rupture the complex using higher …
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Comparison of user metabolic efficiency between traditional and spring assisted leveraged freedom chair models
… lengths of a field in a timed trial, in both the spring assisted LFC and the traditional LFC. Efficiency in the spring assisted LFC, normalized by the efficiency measured on the traditional chair, was found to be [epsilon]n = .684. This may indicate that there is a higher metabolic cost associated …
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Inertial measurement via dynamics of trapped particles
… is that a trapped particle acts like a mass on a spring, but the restoring forces are provided by electrostatic fields. Exquisitely machined physical mechanisms can be replaced by carefully tuned mechanical physics. Such inertial sensors could be simpler to build yet exhibit superior performance …
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Geometric and elastic properties and mechanical phase separation phenomena in self-assembling mesoscopic helical springs
… the low pitch helices behave like linear elastic springs with a spring constant for a typical example measured to be (4.80 +/- 0.77) x 10-6 N/m. From the observed spread in helix dimension, our theory predicts a corresponding range of spring constants for the structures of 10-7 to 10-4 N/m …
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Upstream Migration Under Shear Flow: Force Generation and Molecular Regulation
… behavior — pseudo-catch — when the apparent spring constant of the series complex falls below the transition state threshold. This provides a mechanical criterion for assessing whether molecular force probe configurations report faithfully on intrinsic receptor-ligand kinetics or generate …
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Vibrational and mechanical properties of disordered solids
… and vibrational properties of nearest neighbour spring networks based on depleted lattices we were able to show that the dominating quantity of the system’s non-affine reorganisation during shear deformation is the affine force field. Furthermore we found that different implementation of disorder …
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Stratification in Drying Particle Suspensions
… expression is derived for the corresponding spring constant that depends on the surface tension and lateral span of the interface and the particle radius. I further show that with a careful mapping, both explicit and implicit solvent models yield similar stratification behavior for drying …
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MODELLING AND SIMULATION OF MICROACCELEROMETER
… the works developed. This thesis analyses five spring configurations and derives the spring constants using energy method. The spring configurations include fixed-fixed flexure, folded flexure, "U" folded flexure, extended folded flexure and extended "U" flexure. The natural frequency is also …
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Silicon Piezoresistive Microcantilever For Potentiometric Sensing
… sensor. The dimension-related quality factor and spring constant of microcantilevers are investigated to improve their sensitivity. Using fabricated Si piezoresistive microcantilever and Pt coated substrate, an miniaturized potentiometric sensor is demonstrated with detection capability of 200 ppm …
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Development and Characterization of a Mechanically Prestressed Piezoelectric Composite
… was able to define the center displacement constant and effective spring constant of the unimorph. These parameters not only allow designers to predict the displacement that will occur in response to a given electric field or tensile load, but also to allow for comparison with various …
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Structure-Property Relationships in Nitride Electronic Devices
… diamond coated tip and a cantilever with a high spring constant. The tip is positioned near the Ohmic contact and the sample edge. After tip selection and positioning, the tip should be milled blunt enough by continuously scanning it across the sample surface in contact mode, with a higher …
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Surface Deformations of Magnetic Continua in Homogeneous Fields
… by a harmonic oscillator model, where the spring constant changes with time. From the deformation parallel and perpendicular to the applied field, Poisson´s ratio can be calculated, which turns out to be close to the limit of incompressibility. The absolute values of the deformation are …
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Biomechanics of Hierarchical Elastic Systems
… but instead by elastic energy stored in a spring. By demonstrating that the power required to generate ultrafast movements exceeds the limits of muscle, many studies conclude that energy storage is necessary; but, what these studies do not explain is how the properties of a biological …
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Thin-Film Polymer Nanocomposites Composed of Two-Dimensional Plasmonic Nanoparticles and Graphene
… of 200 - 500 Ω across the membrane. A typical spring constant of the membrane is ~387 N/m. Dynamic electromechanical actuation shows that the membrane vibrates at various input frequencies. The polymer/graphene film has excellent acoustic properties, and when used as a speaker membrane, it …
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Auflösungsvermögen und Genauigkeit der Kelvinsonden-Rasterkraftmikroskopie und deren Anwendung an molekularen Systemen
Die Arbeit befasst sich mit der Erforschung und Anwendung der Kelvinsonden-Rasterkraftmikroskopie. Die Technik wird bezüglich der Quantität der gemessenen Werte und der erzielbaren lateralen Auflösung untersucht und auf diverse Probensysteme angewandt. Die so erhaltenen nanoskopischen Werte werden …
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