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 129 for “"air gap"”.
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Hollow fiber membrane-based air gap membrane distillation
… solution is achieved by one type of MD namely, Air Gap Membrane Distillation (AGMD). The characteristics of AGMD are evaluated by using a hollow-fiber-set-based compact device. Hot brine solution and cold water are passed through two different fiber sets separately: porous hydrophobic …
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Air-Gap Wound Alternators for Large-Scale Power Generation
The airgap-wound or slotless alternator is similar to the conventional type of alternator used for central power generation, but the windings of both the fixed and rotating components are situated in the gap normally separating the two, rather than in slots milled into the steel surfaces. It is …
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Shape distortion and air gap formation during continuous casting.
… to the shape distortion and the formation of an air gap. The work postulates that the behaviour of this shell can be analysed as that of a flexible structure formed by four elasto-perfectly plastic beams linked by rigid comers. This "box" represents the whole section of solidified shell at a …
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Air-gap sacrificial materials by initiated chemical vapor deposition
… as P(npMAco-EGDA), was selected as the potential air-gap sacrificial material among possible combination of twenty monomers and four crosslinkers. P(npMA-co-EGDA) was deposited onto substrates using initiated chemical vapor deposition (iCVD) technique. Spectroscopic data showed the effective …
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BEHAVIOR OF BUSBAR DIFFERENTIAL RELAYS WITH AIR-GAP CORE CURRENT TRANSFORMERS
… primary current. Power utilities normally use air-gap core and solid-core CTs. Air-gap core CTs are expensive and hard to maintain but they are able to reproduce the primary current without becoming saturated unlike solid-core CTs. Nowadays relay manufacturers claim that no matter what type of …
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Modelling and Performance Evaluation of the Virtual Air Gap Variable Reactor
This thesis describes a novel device, the Virtual Air Gap Variable Reactor (VAG-VR), which is capable of producing a continuously variable reactance by locally saturating a small section of the reactor core via an embedded dc control winding. Variable Reactors have many applications in the power …
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Design of an air gap armature for the MIT superconduting generator
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Variable air gap axial flux permanent magnet machine with mechanical field weakening
… mechanical field weakening are (a) to vary the air gap between the two magnet rings (that constitute the rotor) and the stator (with the windings) and (b) to twist the two magnet rings around the main rotational axis, thereby offsetting the magnet poles and reducing the air gap flux density …
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Evaluation and optimization of axial air gap propulsion motors for naval vessels
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Conversion of Saline Water to Fresh Water Using Air Gap Membrane Distillation (AGMD)
… author has studied various aspects of air gap MD process (AGMD). A one dimensional analysis for the overall transport in an AGMD process has been done in the present study considering all the mass transfer resistances present in the process. A two dimensional analysis of the heat and …
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Investigations on Air-cooled Air Gap Membrane Distillation and Radial Waveguides for Desalination
This thesis presents investigations on air-cooled air gap membrane distillation for desalination and the application of radial waveguides based on total internal reflection for solar thermal desalination. Using an air-cooled design for an air gap membrane distillation (AGMD) process may result in …
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Digital simulation of a four-winding, uniform air-gap, rotating AC electrical machine for dynamical analysis studies,
Thesis (Mech. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1969.
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Visualization and measurement of filmwise and dropwise air gap membrane distillation at varied module inclination angle and gap spacer Orientation
… water desalination technologies such as air gap membrane distillation (AGMD). While the system is dominated by heat and mass transfer resistances in the air gap specifically, very little is known about the impact of variations in the air gap, including air gap spacers and module tilting. …
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Design of contactless capacitive power transfer systems for battery charging applications
… develop a high power system for small and large air-gaps applications, concurrently possessing high efficiency. To tackle the problems stated, two modified converters where proposed. The first proposed topology could yield higher power transfer for small air-gap applications. The topology …
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Extrinsic Fabry-Perot interferometer for surface acoustic wave measurement
… fiber, used mainly as a reflector, form an air-gap that acts as a low-finesse Fabry-Perot cavity. The Fresnel reference reflection from the glass/air interface at the front of the air-gap interferes with the sensing reflection from the air/glass interface at the far end of the air-gap in the …
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Heat transfer in vertical concentric cylinders in a high level nuclear waste repository
… surrounded by an enclosed vertically concentric air-gap inside the borehole. The expected initial heat generated is 4.74 kW per container and it degenerates exponentially with time. A computer simulation model is used to find the thermal performance for the air-gap and the problem is solved in …
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Design and control methods for high-accuracy variable reluctance actuators
… are highly nonlinear with both current and air gap. They also display other nonlinear behavior from hysteresis and eddy currents. Linearizing the reluctance actuator is required for the high force accuracy required in the scanning stage. In this thesis, we present a way to linearize the …
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Micro-optical fiber devices used with modal domain sensing
… optical fiber coupler. A third device, the air-gap splice used with multimode fibers, can examine the modal content of an optical fiber. A basic theoretical understanding on how these devices operate is reviewed. A splice loss calculation for few-moded optical fibers is presented. …
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A Multi-Point Measurement Technique for the Enhancement of Force Measurement with Active Magnetic Bearings (AMB)
… requiring knowledge of coil currents and air gap lengths. Some researchers have utilized magnetic flux probes to eliminate the need for air gap measurements, but these are limited by physical size constraints and require complex hardware. This thesis presents a new method for measuring …
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Six-Axis Levitated Stage with a Novel Flux-Steering Magnetic Hub Actuator
… 20 copper wire. The teeth each have a nominal air gap of 0.5 mm with the mover, though only half of the air gap is used for motion (250 µm radius circle of travel). To increase the force density, permanent magnets are arranged to create north poles on the mover and south poles on each stator …
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