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 34 for “"Portable Power"”.
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Man-portable power generation devices : product design and supporting algorithms
… are a promising alternative to batteries for manportable power generation. These devices are potential consumer products that comprise a more or less complex chemical process, and can therefore be considered chemical products. With current computational possibilities and available algorithms it …
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Acoustic and thermal packaging of small gas turbines for portable power
To meet the increasing demand for advanced portable power units, for example for use in personal electronics and robotics, a number of studies have focused on portable small gas turbines. This research is concerned with gas turbine generator units in the 1 kW range. The compact and small-scale …
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Reduction of Secondary Flow Losses in a Turbine for Use in Man-Portable Power Generation
<p>As the world has moved into a more energy-demanding environment, there has been the push for higher energy density in a smaller package. One of the potential solutions is through the application of a gas turbine engine; yet the challenge is extracting the energy efficiently through the small …
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A battery powered near infrared (NIR) camera for the MIT HelioDome
… current Heliodome operations by developing a portable power source for the NIR camera. A portable power system has been designed and constructed to operate the NIR camera during measurement sessions. The portable power system allows the rotating table to rotate completely free of constraints …
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A MEMS thermoelectric generator
The demand for portable power is large and expanding. Technologies currently available to meet this demand include batteries, fuel cells, thermophotovoltaic (TPV) generators and thermoelectric (TE) generators. Fuel cells and generators offer significantly improved performance over batteries, but …
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Performance Characteriztion and Modeling of a Passive Direct Methanol Fuel Cell (DMFC) over a Range of Operating Temperatures and Relative Humidities
… becoming an increasingly more probable means for portable power production. In such applications a passive air breathing direct methanol fuel cell would be ideal. However, successful use of the passive DMFC in such applications requires that the fuel cell be capable of operating at various …
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Development of a liquid-fueled micro-combustor
… shirtbutton-sized gas turbine engines for use as portable power sources. As part of an effort to develop a microscale gas turbine engine, this thesis presents the modeling, design, fabrication, and experimental characterization of a microcombustor that catalytically burns JP8 fuel. Due to high …
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A Lorentz-force actuated controllable needle-free drug delivery system
… parameters can be achieved. In addition, several portable power systems for this injector were developed, allowing the energy-intensive needle-free injector to be used in the field. The injector design was tested for repeatability and use for both in-vitro and in-vivo testing on murine tissue …
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Pulsed nanosecond dielectric barrier discharge in nitrogen at atmospheric pressure
Small power devices are of strong interest as many electronics are made more compact. Those portable power sources are widely used in aerospace applications such as small UAVs and satellite thrusters. Typically, these portable devices rely on batteries, but small power generators based on …
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Concept and feasibility study of self-organized electrochemical devices
… he proposed then is still present in today's portable power sources. In this work, using attractive and repulsive London-van der Waals forces, a self-organized, interpenetrating, separator-free rechargeable lithium ion battery called a self-organized battery system (SBS) is proposed. In this …
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Evaluation of micro solid oxide fuel cell technology
… type of fuel cell being researched for use in portable electronic devices or applications requiring portable power. This emerging technology combines fuel cell technology with microfabrication technology to achieve a micro sized fuel cell on a small silicon die. The potential exists for …
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Emissions reduction benefits of adapting electronic closed loop fueling control on a mechanically controlled spark-ignited engine
… or utility engines, such as those used in portable power generation, construction, irrigation and ground power applications.
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RecoNode: Towards an Autonomous Multi-Robot Team Agent for USAR
… quarters. Yet, small size limits actuator power, sensor payloads, computational capacity and battery life. We are alleviating these issues by developing the hardware and software infrastructure for high performance, heterogeneous, dynamically-reconfigurable miniature USAR robots, as well as …
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A microfabricated solid oxide fuel cell
… electronic devices comes the rising demand for portable electric power. Current battery technology gives a very modest energy return per weight or volume. Hydrocarbons have a significantly higher energy density, and so fuel conversion systems only need to have several percent efficiency to match …
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Linearly-acting variable-reluctance generator for thermoacoustic applications
… battlefield equipment have created a demand for portable power systems with greater power density and more flexibility than current battery sources alone can provide. One potential solution lies in portable, high-frequency thermoacoustic engines, which can provide a battery recharge station or …
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Design, fabrication, and characterization of a micro fuel processor
The development of portable-power systems employing hydrogen-driven solid oxide fuel cells continues to garner significant interest among applied science researchers. The technology can be applied in fields ranging from the automobile to personal electronics industries. In order for fuel cell …
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Energy storage in carbon nanotube super-springs
… springs. The conceptual design of a rechargeable portable power source is developed as a tool to study the performance and feasibility of building such a device.
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Synthesis and Characterization of Polymer Composites Containing Aligned Conducting Polymers and Carbon Nanotubes
… tap into the waste heat generated to produce a portable power source. Thin film thermoelectrics offer a viable solution and have several structural, chemical and economical advantages over inorganic thermoelectric materials. However, their low power factor compared to that of inorganic materials …
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A MEMS valve for the MIT Microengine
… a micro-scale gas turbine generator for high power density output in applications such as portable power source or micro air vehicles. For closed-loop operation, a valve is required to be able to withstand 10 atm upstream pressure under high-temperature operating environment (700K), and result …
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An air-breathing, portable thermoelectric power generator based on a microfabricated silicon combustor
The global consumer demand for portable electronic devices is increasing. The emphasis on reducing size and weight has put increased pressure on the power density of available power storage and generation options, which have been dominated by batteries. The energy densities of many hydrocarbon …
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