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 262 for “"High aspect ratio"”.
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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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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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Interaction of High Aspect-Ratio Micro-Pillars with Wall Turbulence
… interaction 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. …
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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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A high aspect-ratio silicon substrate-via technology and applications
… ground connections. 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 …
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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
… utilized for PNG technology due to low toxicity, high flexibility, and facile solution processing which provide manufacturing opportunities such as screen printing. Throughout the last decade, countless projects have focused on how to enhance the energy harvesting capabilities of these PNGs …
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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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Fabrication of high aspect ratio silicon nanostructure arrays by metal-assisted etching
… to create ordered and densely-packed arrays of high-aspect-ratio single-crystal silicon nanowires with uniform crystallographic orientations. Nanowires with sub-20 nm diameters were created as either continuous carpets or as carpets within trenches. Wires with aspect ratios up to 220 with much …
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Understanding the Impact of High Aspect Ratio Nanoparticles on Desalination Membrane Performance
… addressed on a large scale by membrane-based separation processes for the last six decades. Commercial membrane technology within one operation, reverse osmosis, has remained consistent since the late 1970s, however within the last two decades, access to nanotechnology has created a realm of study …
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Design and measurement analysis of hot embossing system for high aspect ratio microfluidics
… is known as the assay channel. This feature is a high aspect ratio channel with a depth of 50 microns and width of 4 mm. A 10- micron ridge is adjacent to the channel. Several measurement methods were evaluated with gage repeatability and reproducibility studies to determine the methods most …
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Functionalized High Aspect Ratio Cellulose Nanocrystal Filled Composites for Gas and Liquid Separations
… a ubiquitous feature of industry, and these separations are necessary for every facet of life down to the simple functions of breathing clean air and drinking potable water. These chemical separations account for a large portion of the total energy use both in the United States and globally. …
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Development of Stochastic and Anisotropic Multiscale Ceramics Using High Aspect Ratio Sacrificial Fillers
This thesis aims to establish a straightforward and cost-effective way to form porous ceramics. There is a specific emphasis on creating anisotropic structures via a directional ice-templating technique and hard-templating using the sacrificial filler method. Cellulose nanocrystals (CNCs) aerogels …
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Electrodeposited metal matrix nanocomposites as thin films and high aspect ratio microstructures for MEMS
… of metal-matrix nanocomposites as thin film and high aspect ratio microstructures (HARM’s) for MicroElectroMechanical Systems (MEMS) components is examined. The effect of -Al2O3 nanopowder on copper reduction from acidic and basic electrolytes is examined with rotating disk electrodes (RDE’s). …
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Improvement in Orientation Predictions of High-Aspect Ratio Particles in Injection Mold Filling Simulations
… injection molded parts provide a light-weight high-strength alternative for use in automobile applications. These composites have enhanced mechanical properties compared to those of pure polymers, if the fibers are oriented in the right direction. One of the major challenges in processing of …
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Super-conformal coating and filling of high aspect ratio recessed structures by two-molecule CVD
… including iodine catalyzed Cu growth or high-density plasma CVD, have provided super-conformal coating and complete filling. In this dissertation, I report a newly discovered and general method to achieve super-conformal coating suitable for two-molecule CVD at low temperatures, which …
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The Effects of Elasticity in the Foundation on the Flutter of a Metallic High Aspect Ratio Wing
… study the flutter characteristics of a metallic high-aspect ratio wing, with linearly varying chord across the semis-span, and a simulated elastic foundation. The general planform of the wing is similar to the one found in a High- Altitude Long-Endurance Uninhabited Aerial Surveillance Vehicle …
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HIGH-PERFORMANCE PERIODIC ANTENNAS WITH HIGH ASPECT RATIO VERTICAL FEATURES AND LARGE INTERCELL CAPACITANCES FOR MICROWAVE APPLICATIONS
… gaps with very tall sidewalls, referred to as high aspect ratio (HAR) gaps. When such cells are used in the structure of the proposed periodic antennas, the high capacitance of HAR gaps decreases the resonance frequency, mitigates conduction loss, and thus, yields considerably small high …
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