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 418 for “"micro-scale"”.
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Micro-scale turbopump blade cavitation
The possibility of a silicon micro-fabricated turbopump for the use in a micro-fabricated bipropellant liquid rocket engine is of interest. Such a pump might have airfoils on the order of 1mm chord and 0.2mm span and operate at a Reynolds number of 6000. Cavitation is a major technical issue in …
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A study on micro-scale combustion
Based on a review of microcombustion, the objectives of this study are set up. To achieve these objectives, several steps such as scale analysis, numerical simulation, and experimental investigations have been applied to combustion in a cylindrical microcombustor. Scale analysis helps to specify …
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A study of micro-scale jet pumps
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Photometric stereo for micro-scale shape reconstruction
This dissertation proposes an approach for 3D micro-scale shape reconstruction using photometric stereo (PS) with surface normal integration (SNI). Based on the proposed approach, a portable cost-effective stationary system is developed to capture 3D shapes in the order of micrometer scale. The PS …
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Micro-Scale and Nonlinear Vibrational Energy Harvesting
… through the piezoelectric effect at the MEMS scale. Effective energy harvesting devices typically consist of a cantilever beam substrate coated with a thin layer of piezoceramic material and fixed with a tip mass tuned to resonant at the dominant frequency of the ambient vibration. The …
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Micro-scale processing of diamond structures and devices
… with high etch controllability (on the nanometre scale) and capabilities of removing the sub-surface damage and improving the surface smoothness, is only half of those by using Ar/0₂ plasma. Based on these studies, various diamond micro-optics including diamond microspherical positive and negative …
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Transfer Printing and Micro-Scale Hybrid Materials Systems
Micro- and nano-scale engineering, especially as it applies to integrated circuits, has impacted society in revolutionary ways. These integrated circuits are characterized by huge numbers of small electronic devices manufactured on semiconductor wafers. Some emerging technologies will require …
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Micro-scale interactions between chemotactic bacteria and algae
… under this model. Recent identification of microscale (<1cm) nutrient patches, such as those produced by algal exudates, explain a potential for these evolved functions. With this new model for the pelagic zone, bacteria, through chemotaxis and motility, can sense and respond to microscale …
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Investigation of model micro-scale reconnecting plasma modes
… the linear complex mode frequencies of model micro-reconnecting plasma modes which have transverse wavelengths of the order of the electron skin depth c/lwpe. This model mode, which can have finite wavelength parallel to the magnetic field, is found in the limit of a straight and uniform …
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Intelligent Health Management for Micro-Scale Wind Turbine Bearings
… field including, common failures that occur in micro-scale wind turbine elements such as: bearings, generator, brake and main shaft. This was followed by mutual condition monitoring techniques that are currently used to detect failures. Lastly, intelligent methods that can be incorporated to …
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Design of a digitally actuated, micro-scale Cartesian nanopositioner
… the design knowledge required to produce a small-scale, low-cost precision positioning device. Accurate motion manipulation on the nanometer level is one of the main challenges facing precision engineers today. With more developed nations' economies being driven in part by the growing …
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Mechanical testing of solid materials at the micro-scale
… and fabrication of structures and systems at the micro-scale requires a sound theoretical understanding and reliable experimental data on the mechanical behavior of materials at that scale. Generation of experimental data requires accurate, robust, reliable, versatile and yet simple micro-scale …
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Modeling, design and analysis of micro-scale Rankine-based systems
… the modeling and design of two major types of micro Rankine-cycle-based machines: a single-Rankine-based power system and a waste-heat-driven cooler. As part of the Massachusetts Institute of Technology (MIT) Micro Engine Project, these projected machines can be combined with the MIT micro gas …
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CHARACTERIZING THE MICRO-SCALE MECHANICAL PROPERTIES OF HYDROGELS AND CANCER CELLS
… (PEGDA), were tested with atomic force microscopy (AFM). We also determined the Young’s modulus (E) of hydrogels with different concentrations. E tended to increase with increased concentration.
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High-Resolution Characterization of Micro-Scale Crack Tip Fields in Zirconium
… measure of plastic deformation ahead of a microscale crack tip. The advantages of HR-EBSD in measuring fine-scale dislocation structures are also described. Chapter V analyzes the elastic field ahead of a microscale crack in Zr with HR-EBSD. The experimental results are compared with CPFE …
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Micro-Scale Simulation of Evaporation, Condensation and Transport in Porous Media
Sub-pore scale modeling of flow in porous media is gaining momentum. The concept of Digital Core Analysis deals with measurements of virtual core and the purpose of such modeling is to replace conventional and special core analysis when the latter are not feasible. One of the challenging concepts …
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Study of Thermofluid Dynamics of an Ultra-Micro Scale Gas "Turbine"
… behaviour through a component of an ultra-micro scale gas turbine (UMGT), the turbine. Here an experimental investigation is firstly conducted to serve as a basis for numerical validation and to prove the feasibility of a 3 dimensional (3D) UMGT scale radial inflow turbine. A numerical …
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Micro-scale scratching by soft pad asperities in chemical-mechanical polishing
… the manufacture of integrated circuits (IC) and micro-electromechanical systems (MEMS), chemical-mechanical polishing (CMP) is widely used for providing local and global planarization. In the CMP process, polishing pads, typically made of polyurethanes, play a key role. Due to the random, rough …
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Modeling Macro-scale Clay Behavior at Micro-scale Clay Particle Interfaces
… has generally been considered from a macro-scale perspective by measuring the macro-scale compression of a clay soil over time. Clay particles in consolidation tests experience shear and normal forces at the inter-particle level due to force applied to the soil at the macro-scale. These …
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