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 388 for “"Pillar"”.
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Aligned GaAs pillar bonding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Photoelastic investigation of pillar stresses
Includes bibliographical references.
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Pillar design for St. Peter sandstone formation
… to extract St. Peter Sandstone. The room and pillar mining method has been successfully used for St. Peter Sandstone mining in a few US locations, however, no one has proposed a rigorous pillar design method. The goal of this research is to: (1) elucidate factors contributing to ground control …
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Fabrication and applications of pillar bowtie nanoantenna arrays
… the fabrication technique and applications of a pillar bowtie nanoantenna (p-BNA). We use different tools to fabricate our nanostructure, namely, electron lithographic tools, evaporator and plasma chambers. The theory of operation of the machines, especially electron beam lithography for higher …
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Investigation into yield pillar behavior and design considerations
Adopting yield pillars has been considered an effective way of alleviating ground control problems and increasing production. The purpose of this research was to study the behavior of yield pillars and to develop the design criteria. After a literature review, two 2-D finite element models were …
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Pillar load transfer mechanisms in multi-seam mining
The mechanisms controlling pillar load transfer from an overlying seam to subadjacent workings is investigated. Mine geometry and geology are researched as major variables affecting interaction between contiguously placed seams. The thesis includes photoelastic experimentation, finite element …
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Novel pillar formation in evaporating poly(ethylene oxide) droplets
… stain, flat uniform “pancakes", or tall central “pillars". To investigate this phenomenon, I varied experimental factors including: atmospheric temperature, humidity and pressure; polymer molecular weight and concentration; water-ethanol solvent ratios; droplet volume, contact angle and …
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Head impact characterization of generic A-pillar of an automobile
… to provide head impact protection, viz., an A-Pillar. Using the finite element method, a generic cross-section of an A-Pillar is constructed and is used to investigate and compare the performances of aluminum and steel as structural material for meeting government head impact requirements.;For …
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Numerical Modeling of Room-and-Pillar Coal Mine Ground Response
… The interaction between the small scale (pillar stress-strain) and the large scale (ground response curve) is studied. Further analysis between these two length scales is conducted to estimate the stress on pillars in a room-and-pillar coal mine. These studies are performed in FLAC3D by …
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Bump control design protocol for room-and-pillar retreat mining
… are the explosive failure of highly stressed pillars. The protocol was developed for room-and-pillar retreat mining conducted with available continuous miner technology. The inability of existing coal pillar equations to accurately represent the wide total extraction pillars required, forced …
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The replication of micron scale pillar arrays for medical ultrasound applications
… However, a 10 MHz piezocomposite would require a pillar array structure with an aspect ratio of > 9 and a feature size of < 30 μm; which makes fabrication difficult and increasing the operating frequency challenging. Several processes have been developed to improve on the industry standard, dice …
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Stick-slip behavior of liquid droplets on pillar-arrayed PDMS surfaces
… force over time when moving droplets over micropillar pattened surfaces. MATLAB programs were developed to analyze both force and image data. Four parameters are found to have strong correlation with a droplet’s stick-slip behavior: pillar array spacing, droplet moving velocity, liquid surface …
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Pillar-supported plasmonic nanoantennas for optical nanotweezers and optical audio applications
… and confinement properties of arrays of pillar-supported Au bowtie nanoantennas (pBNAs), a new type of bowtie nanoantenna that evolves from its previous substrate-bound version, for plasmonic optical trapping and plasmonic film application. Compared to its precursors, the pBNAs exhibit …
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The impact of second pillar pensions on a Maltese family-run business
… The research examines the effect of second-pillar pensions on a Maltese family business's financial statements, focusing on Defined Benefit and Defined Contribution plans. It uses IAS 19 accounting rules and various scenarios to analyse the financial implications of each pension plan …
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Will implementing pillar two measures hinder the rehabilitation of South African Mines?
… Act”) was enacted in South Africa to implement Pillar Two measures in South Africa. Pillar Two imposes a global minimum tax of 15 per cent on multinational entities with revenue of EUR750 million or more to prevent large multinationals from shifting their profits to low-taxed jurisdictions. The …
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The Cosmos as a Uniting Pillar of Relationships: A Diné & Hózhó Perspective
Outer space is a shared ancestral environment of unbounded cultural value to humanity. Representing a common past and molding a collective future, our ethics, philosophies, technologies, and dreams of living in the cosmos are having profound effects on our lives on Earth. As access to spaceflight …
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