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 12 of 12 for “"tip surface"”.
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Optical and Plasmonic Properties of Metallic Tip /Surface Junctions
… frequencies. Introducing a nanopraticle or a tip to an infinite metallic surface breaks the continuity of the surface allowing coupling with light. This leads to remarkable nearfield focusing and enhancement at optical resonances through the gap between the metallic nanoparticle/tip and the …
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Atomic force microscope cantilever with reduced second harmonic frequency during tip-surface contact
We describe an atomic force microscope cantilever design for which the second flexural mode frequency can be tailored relative to the first mode frequency, for operation in contact with a substrate. A freely-resonating paddle internal to the cantilever reduces the stiffness of the second flexural …
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Experimental and Computational Study of Heat Transfer on a Turbine Blade Tip with a Shelf
… path for hot gases. Gases that flow through the tip region cause pressure losses in the turbine section and high heat loads to the blade tip. This thesis studies the heat transfer on an innovative tip geometry intended to help reduce aerodynamic losses. The blade tip has a depression (shelf) on …
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Optomechanical damping of a microcantilever force sensor in liquid
… non-equilibrium deflection close to the surface. This limitation can obscure ultrahigh force resolution and short range force measurements, and limits the accessible dynamic range. More stable stiff cantilevers have poor force resolution. The force resolution of the softest standard …
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Intelligent field emission arrays
… processes- the flux of electrons to the tip surface followed by the transmission of the electrons through the surface barrier. Either of these processes could be the determinant of the emission current. Unstable emission current is usually due to absorption/desorption of gas molecules on …
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Effects of Tip Clearance Gap and Exit Mach Number on Turbine Blade Tip and Near-Tip Heat Transfer
… on local heat transfer characteristics on the tip and near-tip regions of a turbine blade with a flat tip, tested under transonic conditions in a stationary, 2-D linear cascade consisting of seven blades, the three center blades having a variable tip clearance gap. The effects of tip clearance …
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Tip leakage flow, heat transfer and blade lifing in a jet engine turbine
… developing flow and heat transfer in turbine tip gaps. Successful calculations of the heat transfer to a model turbine blade tip were obtained with a Prandtl mixing length turbulence model. The calculations revealed details of the flow development including recirculation and reattachment on …
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Comparison of the Thermal Performance of Several Tip Cooling Designs for a Turbine Blade
… unique methods of cooling the turbine blade tip. The first method employs holes placed directly in the tip which inject coolant onto the blade tip. The second and third methods used holes placed on the pressure side of a blade near the tip representative of two different manufacturing …
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Exploring the Nonlinear Dynamics of Tapping Mode Atomic Force Microscopy with Capillary Layer Interactions
… microscopy is an oscillating cantilever whose tip interacts with a sample surface. The tip-surface interactions are strongly nonlinear, rapidly changing, and hysteretic. We explore numerically a lumped-mass model that includes attractive, adhesive, and repulsive contributions as well as the …
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Theoretical Modelling and Characterisation of Concerted Tip and Surface Effects in NC-AFM
Rising interest in functionalising molecules and surface and building nano-devices, that is nanotechnology, has in uenced demand for techniques that image molecules and surfaces with atomic precision. One such technique that has answered this call is Non-Contact Atomic Force Microscopy (NC-AFM), …
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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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Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
… utilising the scanning Kelvin probe (SKP) for surface potential mapping and monitoring changes in work function due to environmental influences in ambient and UHV conditions. The SKP is a truly non-contact technique which determines local work function changes and surface states on conductors, …