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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 805 for “"aspect ratio"”.
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Charging in Aspect Ratio Dependent Etching
… technique for sidewall charging in high aspect ratio features exposed to a plasma environment. Currently, high aspect ratio features, holes which are very deep but not very wide, on semiconductor chips are used in order to create the cutting edge computer memory that is used in everyday …
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Experimental investigation of low aspect ratio aerofoils.
Thesis: M.S., Massachusetts Institute of Technology, Department of Ocean Engineering, 1972
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Capillary Force in High Aspect-Ratio Micropillar Arrays
High aspect-ratio (HAR) micropillar arrays are important for many applications including, mechanical sensors and actuators, tunable wetting surfaces and substrates for living cell studies. However, due to their mechanical compliance and large surface area, the micropillars are susceptible to …
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Aeroelastic studies on a high aspect ratio wing
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Heat Transfer from Low Aspect Ratio Pin Fins
… oriented perpendicular to the flow. The configurations studied have spanwise spacing to pin diameter ratios of two, four, and eight. Low aspect ratio pin fins were studied whereby the channel height to pin diameter was unity. The experiments are carried out for a Reynolds number range of 5000 to …
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Air flow in a high aspect ratio heat sink
The increasing heat output of modern electronics requires concomitant advances in heat sinking technology: reductions in thermal resistance and required pumping power are necessary. This research covers the development of a novel type of air-cooled heat sink, in particular the air flow through such …
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Aspect ratio effects on wings at low Reynolds numbers
… primary objective was to determine the effect of aspect ratio in particular and in general the effect of three dimensionality on the flow around wings at low Reynolds numbers. It was seen that the effects observed at high Reynolds number are also present in this Re range. There is the usual …
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Interaction of High Aspect-Ratio Micro-Pillars with Wall Turbulence
… between hairy structures modeled as high-aspect ratio micro-pillars (HAMuP) and wall turbulence is presented. Micro-pillars are elastic, hair-like microstructures which have been inspired by naturally occurring examples like lateral line sensors in fish and air flow sensors in bats. The …
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High aspect ratio electrodes for high yield electroporation of cells
Electroporation is a widely used process in cell biology studies. It uses an electric field to create pores on the cell membrane in order to either insert exogenous molecules inside the cells or disrupt the cell membrane to kill the cells. Current micro-fluidic electroporation devices use the …
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Multidisciplinary Design Optimization of an Extreme Aspect Ratio HALE UAV
… Design Optimization of an Extreme Aspect Ratio HALE UAV Bryan J. Morrisey Development of High Altitude Long Endurance (HALE) aircraft systems is part of a vision for a low cost communications/surveillance capability. Applications of a multi payload aircraft operating for extended …
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A high aspect-ratio silicon substrate-via technology and applications
… As silicon RFICs strive for high-frequency operation, it becomes increasingly important to reduce all extrinsic parasitics. Of particular concern is the MOSFET source or BJT emitter impedance, which greatly affects the gain of RF amplifiers. To address this, we have developed a through-wafer …
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Determination of Surface Free Energies and Aspect Ratio of Talc
… permitted the quantitative determination of the aspect ratio of highly anisometric particles, such as talc. The same trend obtained using flow microcalorimetry was observed for the evolution of the aspect ratio as a function of particle fineness, i.e. the fracture prevails over delamination after …
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Design Optimization of a High Aspect Ratio Rigid/Inflatable Wing
High aspect-ratio, long-endurance aircraft require different design modeling from those with traditional moderate aspect ratios. High aspect-ratio, long endurance aircraft are generally more flexible structures than the traditional wing; therefore, they require modeling methods capable of handling …
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Influence of High Aspect Ratio Nanoparticle Filler Addition on Piezoelectric Nanocomposites
… capabilities of these PNGs through the incorporation of nanoparticle fillers, which have been reported to enhance the piezoelectric properties of the film either directly through their intrinsic piezoelectric properties or through acting as surfaces for the interfacial nucleation of …
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Influence of aspect ratio on dynamic stall of a finite wing
The influence of aspect ratio, AR, on the unsteady aerodynamics of pitching wings was examined by comparing experimental performance, flow measurements, and computational results across a range of different AR wings. Performance measurements were acquired for three wings of AR = 3, 4, 5, and an …
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Ultra-high-aspect-ratio nanofluidic channels for high-throughput biological applications
… to be the enabling technology for sample preparation of proteomic biosamples, which has been the bottleneck in proteomics. Most microfabricated nanofluidic channels, such as planar nanochannels and square nanochannels, suffer from small open volume and, as a result, low sample throughput, …
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