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 205 for “"power source"”.
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Medium size nuclear power source for space propulsion and applications.
Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Thesis. 1970. M.S.
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Low-head hydropower as a reserve power source for wind power
Wind power generation faces intermittency challenges, typically requiring reserve power generation sources burning fossil fuels to maintain reliability of the electricity grid in the event of a decrease in wind. This study proposes an alternative hypothesis: that hydropower turbines installed at …
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The six phase rectifier as a power source for operating DC motors
It can definitely be stated that the results of the experiments show that almost no appreciable adverse effects on the test motor result from six phase rectifier operation, The efficiency was unaffected by rectifier operation, The temperature rise with rectifier operation was roughly within 5°C of …
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A miniaturized single crystal silicon solar cell array for a MEMS power source
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Design and manufacturing proposal for a stair-climbing wheelchair without an external power source
… the wheelchair will not have any outside power source. The user's strength is the only means of energy for climbing. Our specific design relies on three critical modules: wheels with retractable spokes, a lock-in ratchet on the axel, and a seat-tilting mechanism. By focusing on integrating …
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Operations manual for student-team-built hybrid power source to recharge an Unmanned Undersea Vehicle
Unmanned Undersea Vehicles (UUVs) have the potential to explore and monitor oceans in unprecedented ways, but their present batteries only allow them to operate for days at a time. A team of students designed and built a gasoline-hybrid recharging system for a Remus 600 UUV to extend its operating …
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Feasibility of using Waste Heat as a power source to operate Microbial Electrolysis Cells towards Resource Recovery
… that can treat wastewater and also recover resources such as energy in the form of electricity/hydrogen gas and nutrients such as nitrogen and phosphorus compounds. Microbial electrolysis cell (MEC) is a type of BES that, in the presence of an additional voltage, can treat wastewater and …
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Design, Implementation and Evaluation of a Microgrid in Island and Grid Connected Modes with a Fuel Cell Power Source
… in the development and evolution of the modern power system. The principle objectives of this research are (1) to simulate a simple microgrid consisting of a PEM hydrogen fuel cell, load and connection to the grid and (2) to evaluate the resulting microgrid control system on a corresponding …
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Design and fabrication of retrofit e-bike powertrain and custom lithium-ion battery pack
… converted to a functional e-bike with electric powertrain, involving a hub motor, a custom power source, and throttle speed control. A custom battery pack was designed to meet system performance specifications and fabricated using individual lithium-ion cells. Overall design parameters included: …
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Synergic control in MIG welding and penetration control in TIG welding
… based on the generalised quadratic and linear ‘power-current' and linear ‘voltage-current’ equations which adequately describe the MIG welding operation. The controls are low coat electronic units which are added to a ‘transistor’ controlled power source. The units based on the ‘power-current’ …
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Evaluation of smart-fabric approach to biomechanical energy harvesting
… of piezoelectric energy harvesting methods as a power source for light-up sneakers. Light-up sneakers currently marketed for purposes of pedestrian visibility and personal fashion are powered by primary or secondary batteries; maintenance requirements could potentially be reduced or eliminated by …
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An assessment of reverse electrodialysis for application to small-scale aquatic systems
… (RED) is a means by which to produce electrical power through the flow of Na+ and Cl- ions from seawater to fresh water across ion selective membranes. While current research has largely focused on utilizing RED for large-scale commercial power, this thesis explores the feasibility of using RED …
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Modeling and Design of Betavoltaic Batteries
… (MEMS) necessitate an onboard miniaturized power source. As these devices are highly functional, longevity of the power source is also preferred. Betavoltaic batteries are a very promising power source that can fulfill these requirements. They can be miniaturized to the size of a human hair. …
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Investigation of portable nuclear power systems
… electronic devices do not simply plug into the power grid, due to their size, use, or distance from infrastructure. The use of nuclear power is well-established in large-scale power production, but mostly unutilized in small-scale applications. One potential candidate for small-scale power …
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Image Chipping with a Common Architecture for Microsensors (CAuS)
… and processing subsystems, a radio link and a power source. Sensors employed can range from acoustic, to seismic, to magnetic, to visible/infrared imagers. A notable shortcoming of these systems is the fact that they are battery powered. The use of a finite power source places an upper limit on …
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Development of knee joint angle trajectory tracking for leg support mechanism
… and active types. The active type requires power source to operate its mechanism while the passive type does not require power source. One of the important assistive devices is Knee-Ankle Foot Orthosis (KAFO) that designed for providing leg support during walking. This project is focused on …
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Piezoelectric Micro Power Generator (PMPG) : a MEMS-based energy scavenger
… Auto ID tag has demonstrated the need for a power source with the characteristics of our Piezoelectric Micro Power Generator (PMPG). The PMPG is a MEMS-based energy scavenging device which converts ambient, vibrational energy into electrical energy. It consists of a composite micro-cantilever …
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Implementation of a digital signal processing (DSP) boost inverter for fuel cell energy generation
… (DSP) as a controller in the design of a low power inverter used in Fuel Cell energy source. The fuel cell used in this research is a Heliocentris “Constructor”, a 50W proton exchange membrane (PEM) fuel cell. Fuel Cells are becoming popular and are likely to be used in applications such as a …
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Gerenciamento de potências usando um conversor modular em cascata para veículos elétricos com células a combustível
Proposes a power management strategy based on pq-Theory for fuel cell and electric vehicle applications. Using a modular cascaded converter topology, more than one power source can be combined with capacitors to supply active and reactive power in an efficient manner to the electric motor. The …
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