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 10 of 10 for “"intermittent contact"”.
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Scanning probe microscopy with inherent disturbance suppression using micromechanical systems
… disturbances that is applicable to non-contact and intermittent contact SPM imaging modes. In this approach, two distinct sensors simultaneously measure the probe-sample separation: one sensor measures a spatial average over a large sample area while the other responds locally to …
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Design Concepts for High-Acceleration Linear Actuators for Precision Motion
… in our lab that explored the use of mechanical contact forces managed by a piezoelectric stack actuator (PEA). In this configuration, intermittent contact by the PEA can be used to apply forces to decelerate and reaccelerate the SS stage with respect to the LS stage during turnaround events. …
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The Politics of Health: Community Engagement in South African HIV Vaccine Trial Sites
… of CABS which frustrate collective action; intermittent contact between trial site researchers and CABs; the accountabilities of researchers to donors and communities; and limited representation of those heterogeneous communities. The impact of multiple forms of stigma on marginalised and …
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Hall Potential Mapping of Conducting Ferroelectric Domain Walls
… domain walls was imaged by its influence on an intermittent-contact atomic force microscopy topography profile, confirming the local conduction was mediated by p-type carriers. By calibration of the AFM signal, an estimate of ~ 1x10<sup>16</sup> cm<sup>−3</sup> is calculated for the mobile …
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Regulation in Switched Bimodal Linear Systems
… read/write head to the disk surface results in intermittent contact between the two and a bimodal system behavior, this thesis studies the output regulation problem in switched bimodal linear systems against known and unknown exogenous input signals. The regulation problems in bimodal systems …
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Characterization of nanoscale electronic materials using novel methods for scan probe microscopy
… semiconductors. Finally, we introduce a novel, intermittent-contact, approach to Microwave Impedance Microscopy that uses the native water layer, which exists on surfaces in ambient humidity conditions, to further improve sensitivity and resolution. In addition, this approach doesn’t require any …
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Cantilever Dynamic Analysis in Tapping Mode Atomic Force Microscopy
… Unlike other AFM techniques, it only makes intermittent contact with the sample, which largely reduces any potential surface damage to soft materials, like cells and polymer. Moreover, phase image can also be obtained from tapping mode AFM besides height and amplitude image. Phase images …
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A lumped-parameter model of tire-terrain interactions for off-road vehicles
… the model captures onset and loss of contact, localized stick and slip phases for each of the discrete elements of the tire. The model also characterize events that triggers generic transitions between the different phases of the tire elements. Moreover, special emphasis have been …
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Comprehensive Computational Modeling of Hypergolic Propellant Ignition
… reactions and additional instabilities. However, intermittent contact and limited liquid interaction is seen to be the cause of low average temperatures that are significantly lower than the vapor phase ignition threshold.</p> <p>Lastly, behavior of impinging vapor sheets is studied to discern the …
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Extending the reach of drilling: better wellbore trajectory and torque & drag models
… bending effects, accurately predict the contact forces between the drillstring and the wellbore, and solve T&D parameters from surface to total depth in reasonable time using standard engineering computers. The current 3D borehole trajectory model based on the minimum curvature method …