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 328 for “"Miniaturization"”.
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Miniaturization of Electrical Ultrafine Particle Sizers
… this dissertation studied the development and miniaturization of electrical ultrafine particle sizers (EUPS). There are three essential components for developing a EUPS unit: a charger to electrically charge the sample particles, an electrical mobility classifier to classify the charged …
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Miniaturization and integration of photoacoustic detection
… the detection limit scales favorably with miniaturization. This work focuses on the miniaturization of gas-phase photoacoustic detection of propane in a nitrogen or carbon dioxide ambient. This work could be expanded to other chemical species or to spectroscopy with a change of light …
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Portable product miniaturization and the ergonomic threshold
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Miniaturization methodology applied to deep space microspacecraft
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Power Electronics Meet Piezoelectrics: Converters, Components, and Miniaturization
… However, while integrated circuits have seen miniaturization and expanded performance characterized by Moore’s Law, power electronics often remain the bulkiest, lossiest, and costliest components in the systems they serve. Miniaturization of power electronics is fundamentally bottlenecked by …
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Theoretical and experimental investigation of Hall thruster miniaturization
Interest in small-scale space propulsion continues to grow with the increasing number of small satellite missions, particularly in the area of formation flight. Miniaturized Hall thrusters have been identified as a candidate for lightweight, high specific impulse propulsion systems that can extend …
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Miniaturization, Packaging, and Thermal Analysis of Power Electronics Modules
High power circuits, those involving high levels of voltages and currents to produce several kilowatts of power, would possess an optimized efficiency when driven at high frequencies (on the order of MHz). Such an approach would greatly reduce the size of capacitive and magnetic components, and …
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Miniaturization of Ac-Dc power converters for grid interface
In this thesis we present a two-stage ac/dc grid-connected converter for computer applications. Also known as off-line power supplies, these converters have to meet various demanding specifications such as a wide input voltage range (typically 0-376 V), large voltage step down (typical output …
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Miniaturization of on-chip passive electronic devices by silicon nitride self-rolled-up membrane microtube nanotechnology
Miniaturization of the commonly used on-chip lumped elements is highly desirable to enhance the density, performance and functionality of integrated circuits (ICs) working from DC to millimeter wave frequency band. Numerous improvement methods have been demonstrated but all fail to fundamentally …
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Switchmode Power Supply Miniaturization with Emphasis on Integrated Passive Components on Prefired High Performance Ceramic Substrates
… is a study of Switched Mode Power Supply (SMPS) miniaturization and how to effectively use the available technologies to achieve the ultimate goal of a reduced size without loss of functionality while maintaining a cost effective design. This research investigates several methods used to obtain …
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Development Of A Field-Portable Miniature Mass Spectrometer Designed For In-Situ Analysis And Ion Trap Miniaturization
… reduced ion capacity associated with dimensional miniaturization of the mass analyzer is parallel operation of multiple ion traps, i.e. ion trap array. Chapter 4 details the fabrication and operation of an eight-channel array of 1/3rd scale rectilinear ion traps (RITs) constructed monolithically …
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Ontogeny and evolutionary morphology of the skeleton in frogs
… of this dissertation examines the phenomenon of miniaturization in frogs. Because miniaturization has evolved numerous times in frogs and has reached impressive extremes, frogs make an ideal group in which to study the effects of miniaturization on morphological evolution. I use qualitative …
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Radio frequency miniature passive devices: ferrite antennas and inductors
… decrease in the overall device size. Device miniaturization and compact design, therefore, have become important factors. Radio frequency (RF) passive devices, including antennas and inductors, are key components in mobile telecommunication systems. The interaction of magnetization dynamics …
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Miniaturized Magnetostrictive Antennas for Wireless Sensing Applications
… widely used for wireless sensing applications. Miniaturization of MES antennas can open new applications in in-vivo wireless sensing with higher spatial resolution and solve challenges involved in the miniaturization of conventional electromagnetic antennas. In this thesis two different methods …
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Multi-resonant passive components for power conversion
Semiconductor-device limitations to system miniaturization have receded, but exposed by their improvement numerous "ancillary" barriers which continue to preoccupy nearly every electronics industry. Prominent among these obstacles are package parasitics and heat, which have come to the fore as …
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Lithium ion power generator : a novel system for direct thermal to electric energy conversion
… has advanced greatly, but a critical obstacle to miniaturization and true autonomy is how to power sensors. Lithium ion batteries have been ideal power sources due to their high power density, but autonomy requires some form of power generation. The unique demands of miniaturization require power …
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Design Automation and Evaluation Of Emerging 3D – IC Technology Using Stacked Horizontal Nanowires
Miniaturization of integrated circuits (ICs) has continuously enabled advancement in modern technology. This miniaturization trend, also known as Moore’s law, needs to be maintained intact to meet the current day computational demands. Further miniaturization of transistors below sub 10nm regime …
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A MEMS thermoelectric generator
… batteries, but issues of fuel processing and miniaturization remain. Microfabrication has the potential to address this miniaturization. Here I present work towards a thermoelectric generator based on micro-electro-mechanical system (MEMS) fabrication technologies. This thesis includes an …
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Investigation and characterization of size effects in microforming processes
<p>The products of miniaturization, such as mobile phones, personal digital assistants, computers and other electronic devices have become an indispensable part of our daily lives. Nowadays, more and more industrial products including some medical and electromechanical products contain micro scale …
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