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 615 for “"pumps"”.
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Semiotics & Syringe Pumps
Semiotics can be a useful paradigm in HCI research and yet the cognitive process of semiosis is difficult to uncover and empirically study. Thus in the domain of HCI semiotics has largely remained a descriptive theory, able to provide a theoretical basis for the study of interfaces and interaction, …
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Microfluidic Electro-osmotic Flow Pumps
… because of its simple design and small size. EOF pumps fabricated on silicon and glass substrates were evaluated. The experimental flow rates were 0.19-2.30 microliters/minute for 40-400 V. The theoretical pump efficiency was calculated along with the generated mechanical power by various pump …
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Comparative study of advanced heat pumps
A numerical simulation study is reported on the thermodynamic performance of several non-CFC refrigeration devices. The study includes complex compound absorption, Brayton, Stirling, and thermoelectric devices. Comparisons are made to the more commonly applied vapor compression systems, including …
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Electrospray emitters For diffusion vacuum pumps
… similar principles as regular diffusion vacuum pumps, an electrospray emitter is set to produce a jet of charged particles that will drag air molecules out of a volume. To be a feasible concept, the emitted particles should have enough momentum to make the colliding air particles being …
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Development of HTS Transformer-Rectifier Flux Pumps
… for superconducting magnets, known as flux pumps. These devices power superconducting magnets wirelessly, isolating the power supply from the magnet both thermally and mechanically. This reduces the power requirement for keeping the magnet cold, cutting both power consumption and the size …
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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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Magnetic levitation for down-hole submersible pumps
… levels equal to conventional submersible pumps, if the current to the motor is increased by a factor of approximately 2.5. Such a current increase is possible without exceeding the thermal limits of the motor. Results show that designing and building magnetic levitation motors for …
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Instabilities and unsteady flows in centrifugal pumps
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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A compilation of notes on steam pumps
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1875
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Parametrization of Triple Screw Pumps for Aerospace Applications
<p>Triple Screw Pumps, a form of positive displacement pump, offer steady, high-pressure flow. In very small launch vehicles or upper stages turbopumps are not practical. This paper examines the performance of triple screw pumps to determine if they may serve as an alternative to turbopumps for use …
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Accuracy of water delivery in enteral nutrition pumps
… the accuracy of delivering 1 L of water by EN pumps using different flush volumes and hang heights. Methods: Three EN pumps were used in vitro to flush 1 L of water at 50 mL per hour for 20 hours and 500 mL every 4 hours for 8 hours, at 0” and 18” hang heights. Fifteen test runs were conducted …
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Reducing the environmental impact of hydraulic fracturing pumps
… is comprised of the fleet of truck-mounted pumps required to provide the high pressures and flows necessary for well stimulation. The established design of these pumps were developed for the shale gas extraction industry in North America, where the environmental, geological, regulatory and …
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Gas engines for domestic engine-driven heat pumps
An experimental and theoretical investigation has been undertaken into the performance of a small prototype, water-cooled, gas-fuelled engine designed for use as a domestic heat pump prime mover. In light of the application, fuel type and capacity, both experimental and theoretical study of similar …
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The economical settings of deep well turbine pumps
Thesis ()--Michigan State College of Agriculture and Applied Science, 1933
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Stokes flows near boundaries: bacteria, corners, and pumps
… the optimal helical shapes to be used as micropumps near surfaces and show that bacterial flagella are nearly optimal. Thirdly, we build a theoretical model on a reorientation of peritrichous bacteria at the edge of a liquid drop on a Petri dish. Bacteria are more likely to turn clockwise …
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Characterizing Failure Modes in Continuous Flow Microfluidic Pumps
… media at low flow rates. While the Microheart pumps in practice have qualitatively provided an indication of media flow through microphysiological systems, the yield rate of production, and efficacy of their function have not been fully characterized. The following study explores the potential …
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Metal Hydride Heat Pumps for Thermal Management of Devices
… energy densities which makes metal hydride heat pumps (MHHPs) particularly efficient devices. Further, a metal hydride heat pump (MHHP) can be tuned to cover a wide range of temperatures. Most phase change materials (PCMs) have a fixed phase change temperature, but metal hydrides are more …
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Electrohydrodynamic Microfabricated Ionic Wind Pumps for Electronics Cooling Applications
… of 12.5 ¿¿m. When compared with other ionic wind pumps, the device developed for this work is superior in terms of heat transfer coefficient and COP. However, the overall performance of the array does not compare favorably to a conventional CPU fan except in terms of COP. Additionally, the …
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