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.
Results
Showing 1 to 20 of 1936 for “"Vacuum"”.
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Vacuum insulation
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1934.
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Vacuum electrostatic engineering
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1933.
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Effect of vacuum level on the vacuum-assisted resin transfer molding process
… with a complicated geometry. The influence of vacuum level, fluid type and preform on the mold filling phase of the resin transfer molding process was experimentally investigated for a flat mold with unidirectional flow. Permeability of M8610 mat and woven roving preform was measured using …
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Topics in vacuum decay
If a theory has more than one classically stable vacuum, quantum tunneling and thermal jumps make the transition between the vacua possible. The transition happens through a first order phase transition started by nucleation of a bubble of the new vacuum. The outward pressure of the truer vacuum …
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Investigation of vacuum breakdown
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Electrical Engineering, 1962
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Direct current hybrid vacuum breaker
… interruption without an arc, this thesis uses a vacuum circuit breaker (VCB) as the main breaker to investigate arc effects on interruption performance, when employing a forced current commutation method. The vacuum arc characteristics are detailed, thereby giving the VCB operation understanding …
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Vacuum refining of lead bullion
Includes bibliographical references.
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Metal vapor vacuum arc switching
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1984.
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Field emission in micro vacuum devices
Sviðsröfun (e. field emission) liggur til grundvallar björtum rafeindageislum, en þeir eru nauðsynlegir í hvers konar hátækniferlum til dæmis örrásaframleiðslu, smásjártækni og við framköllun aflmikilla örbylgjugeisla. Sviðsröfun byggir á því að utanaðkomandi rafsvið aflagar yfirborðsmætti milli …
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Thermal Vacuum Chamber Refurbishment and Analysis
… way to mitigate this risk is to use a thermal vacuum chamber (TVAC). The chamber is designed to resemble a space environment by reducing the pressure within the chamber to 1e-6 Torr. The differentiating factor between a vacuum chamber and a thermal vacuum chamber is the ability for the TVAC to …
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Surface studies in ultra high vacuum
An ultra high vacuum system capable of attaining pressures of 10-12 mm Hg was used for thermal desorption experiments. The metal chosen for these experiments was tantalum because of its suitability for thermal desorption experiments and because relatively little work has been done using this metal. …
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Signature change in spherical vacuum spacetimes
… naturally leads to the Tolman metric, whose vacuum cases cover the Schwarzschild/Kruskal-Szekeres manifold with all possible sets of radial geodesic coordinates. We take the opportunity to explore several cases of signature change in other Tolman models.
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Carbon nanotube-based field ionization vacuum
… The FIP is designed to evacuate volumes from low vacuum (30 Torr) to mid-vacuum (30 Torr). We designed the device using electrostatic simulations. Several designs for the FIP ionizers were developed, and we created a device capable of producing field ionization current of 4 nA using an array of 96 …
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