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 141 for “"Small Diameter"”.
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Dynamic performance of small diameter tunnel thrusters.
The transient response of a small tunnel thruster is studied for step changes in applied voltage to the thruster motor. Previous work on positioning Remotely Operated Vehicles with a ducted propeller had shown that lags in the thruster response caused limit cycling in the vehicle's behavior. These …
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Flow in random regular networks of small diameter
Thesis (Elec.E)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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New structural systems in small-diameter round timber
Trees, when used as structural elements in their natural, round form, are up to five times stronger than the largest piece of dimensioned lumber they could yield. Additionally, these whole-timbers have a lower effective embodied carbon than any other structural material. When combined into …
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Pressure drop with surface boiling in small-diameter tubes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1964.
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The mechanical design aspects of a small diameter vascular prosthesis
Failure of medium to small diameter vascular grafts is believed to be in part due to the compliance mismatch between the native artery and the implanted graft. Consequently, designers are examining the use of more compliant materials for their manufacture. Ether free polyurethanes are currently …
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High porosity electrospun scaffolds for small diameter vascular graft applications
Porosity, pore size and pore interconnectivity have been shown to be critical factors for cellular infiltration into vascular grafts. While electrospinning has been shown to produce many promising characteristics for the fabrication of vascular graft scaffolds, it has yet to create sufficient …
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Determination of the burning rate of small diameter aluminum wire
… was involved with the combustion of 0.020" diameter aluminum in various mixtures of industrial oxygen and nitrogen at a total pressure of one atmosphere. A combustion chamber was constructed similar to that which was utilized in previous investigations involving titanium, zirconium, iron and …
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Hyaluronic acid enhancement of expanded polytetrafluoroethylene for small diameter vascular grafts
… blood vessels are the standard graft used in small diameter (<6mm) arterial bypass procedures. Synthetic small diameter grafts have had limited success. While polyethylene (Dacron) and expanded polytetrafluoroethylene (ePTFE) are the most commonly used small diameter synthetic vascular graft …
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Near-Field Electrospinning and Characterization of Biodegradable Small Diameter Vascular Grafts
<p>The ideal “off the shelf” tissue engineering, small-diameter (< 6 mm inner diameter (ID)) vascular graft hinges on designing a template that facilitates transmural ingrowth of capillaries to regenerate an endothelized neointimal surface. Previous traditionally electrospun (TES) approaches to …
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Flow patterns in upward two-phase flow in small diameter tubes
Two-phase flow in small tubes and channels is becoming a common phenomenon in industrial processes. However, the study of two-phase flow regimes in small tubes is still at its infancy. The previous studies are reviewed and discussed in the literature section. The problems and inconsistencies …
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Extrusion and evaluation of degradation rate and porosity of small diameter collagen tubes
… availability of autografts and failure of small diameter synthetic vascular grafts has stimulated continuing efforts to develop small diameter vascular grafts based on natural materials. The small diameter collagen tubes were extruded using bovine collagen type I. The biodegradation rate …
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Forced-convection surface-boiling heat transfer and burnout in tubes of small diameter
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1962.
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Heat transfer measurements in film condensation of steam on small diameter horizontal tubes
… tubes of 0.122, 0.182, 0.250, 0.375 inches in diameter. Scale effects were eliminated by repeated cleaning of the tubes. Filmwise, dropwise, mixed, and streaky condensation patterns of steam on the horizontal tubes were observed and photographed. The flow pattern in film condensation showed …
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A Business Model for a Red Oak Small Diameter Timber Processing Facility in Southwest Virginia
The conversion of red oak small diameter timber (SDT) into solid wood products was investigated. The objectives of this research were to 1) determine the yield of lumber, pallet and container parts, and residues from SDT and the market potential for these products; 2) determine the economic …
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Design of an apparatus to experimentally verify filmwise condensation theory on small diameter horizontal tubes
… filmwise condensation heat transfer theories for small diameter horizontal tubes was developed. The apparatus was designed so that the condensation pattern was visible at all locations, all of the parameters necessary to calculate the average heat transfer coefficient were accurately determinable, …
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Horizontal Two-Phase Flow of Air-Water Mixtures in Small Diameter Tubes and Compact Heat Exchangers
… was studied in order to determine whether pipe diameter is a significant variable in two-phase flow. Also, the flow patterns that exist in a Compact Heat Exchanger were determined in order to verify or refute the assumption that the flow pattern that exists in the Compact Heat Exchanger is an …
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Granulocyte Colony-Stimulating Factor Minimizes Negative Remodeling of Decellularized Small Diameter Vascular Graft Conduits but Not Medial Degeneration
… and intimal hyperplasia are major causes of small diameter vascular conduit (SDVC) failure. The present study was aimed to investigate the influence of granulocyte colony-stimulating factor (G-CSF) on inhibiting adverse remodeling of decellularized SDVCs. METHODS: Sprague-Dawley rats …
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Development of small-diameter endoscope capable of high-resolution visualization and laser therapy through a shared optical aperture
… not presently possible due to the insufficiently small diameter of currently available endoscopes, which is the result of illumination, visualization, and phototherapy functions each requiring a unique, adjacent, optical aperture. Furthermore, some MIS procedures in common practice could realize …
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In vitro endothelialization of vascular prostheses: a possible means to improve the early patency of small diameter vascular grafts
… remaining endothelial cells were found mainly as small cell islands, densely covered by leukocytes. For that reason, a similar series of baboon experiments was performed, using autologous EC from the external jugular vein. After 9 days of implantation, the patency rate of EC-lined and control …
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Photophysics of carbon nanotubes
… we find that carbon nanotubes less than 1 nm in diameter exhibit dramatic changes in their electron and phonon dispersion relations due to the curvature of the nanotube sidewall and the enhanced electron correlation effects associated with one dimensionality. The optical transition energies in …
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