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 783 for “"valve"”.
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The Green Lane Valve: a Novel Decellularised Heart Valve
… surgical use. Thus, tissue-engineered heart valves have been explored as alternative conduits. Unfortunately, early models have proceeded to clinical use with catastrophic outcomes. The clinical performance of contemporary decellularised heart valves remains unknown. A novel, decellularised …
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Valve seating impact as a source of valve train noise
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Pulmonary Valve Replacement
<p>Currently, transcatheter pulmonary valve replacement (TPVR) is a well-established alternative for surgical pulmonary valve replacement (SPVR) to treat pulmonary valve disorders in patients with prior congenital heart surgery. Edwards Sapien 3 valve is a bioprosthesis originally designed for the …
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Programmable electrohydraulic valve
… pressure measurements from the programmable valve could be used to calculate a flow through any of the cartridge valves, thus eliminating the need for external feedback devices in the hydraulic system: a ""smart"" valve. Hardware limitations in the prototype prevented successful demonstration …
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Comparison of patient outcome for aortic valve replacement verses transcatheter aortic valve replacement
Aortic stenosis or narrowing of the aortic valve is the most common cause for surgical valvular replacement in the United States. The disease of aortic stenosis has a long asymptomatic latency period followed by a quickly progressing symptomatic phase. Symptoms of the disease include dyspnea, …
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MECHANOBIOLOGICAL REGULATION OF ATRIOVENTRICULAR VALVE MORPHOGENESIS
… defects in the structure and function of heart valves. Pediatric patients face years of surgical interventions and treatments because current replacement valves cannot grow with the heart throughout postnatal development. Genetic causes for CHDs are insufficient to explain the prevalence, …
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Stents for transcatheter aortic valve replacement
… disease (RHD) is the leading cause of aortic valve disease in the world. Surgery to repair or replace the diseased valves is the only means to save a patient's life once the disease becomes symptomatic. Transcatheter aortic valve replacement (TAVR) has revolutionised the treatment of …
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Dynamics of a reed type valve
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1949.
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The design and prototyping of a Transcatheter Aortic Valve Implantation training system specific for aortic valve regurgitation.
… The replacement of the regurgitant aortic valve was historically performed by surgical insertion of a bioprosthetic or mechanical heart valve. Transcatheter Aortic Valve Implantation (TAVI) has become a common surgical procedure to replace defective aortic valves. The balloon-expandable …
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Gas lift valve failure mode analysis and the design of a thermally-actuated positive-locking safety valve
… to failure through malfunction of gas lift valves. This is a growing concern as offshore wells are drilled thousands of meters below the ocean floor in extreme temperature and pressure conditions and repair and monitoring become more difficult. Gas lift valves and oil well systems have been …
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Effect of Engineered Surfaces on Valve Performance
Performance of air operated valves is a major maintenance concern in process industries. Anecdotal information indicates that reliability of some high maintenance valves has been improved by using an ion deposition process to achieve engineered surfaces on selected components. This project compared …
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Some flow characteristics of spool valve orifices
… issuing from effectively two-dimensional spool valve orifices. (Aspect ratio 2.5 - 45}. Reynolds number is varied from 200 to 3000 and cavitation number from 0.15 to 0.8.Valve geometry effects are examined by (a) varying the orifice opening and clearance and (b) by providing each valve with an …
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3D printed relief valve analysis and validation
1 PDF file (xi, 92 pages)
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Automobile valve manufacturing : technical and econoimc analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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A MEMS valve for the MIT Microengine
… electro-statically actuated, on/off gas valve made of silicon material has been designed, fabricated and tested. The valve will be a fuel control component in a micro-scale gas turbine engine. Room-temperature testing results using nitrogen have demonstrated repeatable valve functions and …
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Valve design for a hydraulic knee prosthesis.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1973. B.S.
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Experimental implementation of an electromagnetic engine valve
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Erosion test on valve and turbine metals
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1923
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Non-linear response of a fluid valve
… used to study the nonlinear response of a relief valve under a constant static pressure and a sinusoidal dynamic pressure that can be generated by variations in the pneumatic transmission lines. Under certain conditions, large vibrations may occur, causing unsatisfactory performance as well as …
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