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 2999 for “"Replacement"”.
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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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Yang-Mills replacement
We develop an analog of the harmonic replacement technique of Colding and Minicozzi in the gauge theory context. The idea behind harmonic replacement dates back to Schwarz and Perron, and the technique involves taking a function v: ... defined on a surface ... and replacing its values on a small …
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Comparison of patient outcome for aortic valve replacement verses transcatheter aortic valve replacement
… 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, syncope, angina, and heart failure. The disease …
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Conics, unitals and net replacement.
… or the corresponding operation "net replacement". We consider conics and unitals of the finite projective plane PG(2,q²) and observe the effect of net-derivation on their pointsets. Our aim is to determine when the pointsets of conics and unitals of PG(2,q²) are conics and unitals …
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A systems approach to replacement
… this study is a new approach to the problem of replacement of assets which deteriorate and become obsolete with time. The investigator views replacement theory as a subset of capital budgeting. Capital budgeting has received much more attention, has benefited from many advances in mathematical …
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A new metacarpophalangeal joint replacement arthroplasty
… The past and current metacarpophalangeal joint replacements can be divided into three main categories: hinge implants, flexible implants and surface replacement implants. There is some frustration among hand surgeons as these implants fail in vivo in comparison with the replacement of larger …
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An Investigation Into Replacement Cost Surrogates
Three methods of generating replacement cost data were utilized to produce figures which were compared with data reported under ASR #190. The generation methodologies used were those developed by Frank, Kratchman, and Falkenstein and Weil. The comparisons involved not only the data itself, but …
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Stents for transcatheter aortic valve replacement
… becomes symptomatic. Transcatheter aortic valve replacement (TAVR) has revolutionised the treatment of age-related degenerative aortic valve disease, but is currently not suitable for the majority of RHD sufferers due to the rapid degeneration of flexible leaflet valves in younger patients, …
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Robotic grasping of Orbital Replacement Units
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1989.
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Capital investment planning: expansion and replacement.
Massachusetts Institute of Technology, Alfred P. Sloan School of Management. Thesis. 1972. Ph.D.
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Developing scaffolds for full-thickness esophageal replacement
L'abstract è presente nell'allegato / the abstract is in the attachment
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Polyurethane foams containing renewable castor oil replacement
… from polyols with different levels of castor oil replacement. For foams without castor oil and with 25% castor oil replacement, the effects of water added content were studied. Another group of foams made from a castor oil/ glycerol mixture were also prepared to investigate the effects of hydroxyl …
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Management and nutrition of the replacement gilt.
Replacement gilts and early parity sows constitute a large, and increasing, proportion of modern breeding herds. Breeding herd profitability is therefore increasingly dependant on the efficiency of gilt management strategies as well as litter size at first farrowing; however, incidences of …
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Genetics of the Arabidopsis Inflorescence Replacement Program
The long-term goal of this project is to characterize the genes responsible for IRP variation in Arabidopsis. The research presented here began by surveying accessions from a collection of geographically diverse Arabidopsis accessions. Five major phenotypic clusters within 85 accessions were …
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On-Stack Replacement Across User-Kernel Boundaries
… seamlessly continue in user space via on-stack replacement, thus preventing side effects from being executed erroneously. This system for on-stack replacement is very general, allowing execution to switch between code versions at any conditional, and it is novel in its ability to switch stacks …
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Drop-in replacement biofuels : meeting the challenge
… vision. It provides an introduction to drop-in replacement biofuels, the options amongst the technologies and feedstock available to produce them, their current economic performance and the evolution of their commercialization. In pursuing the latter a detailed examination of the funding path …
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