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 348 for “"tolerances"”.
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Computer-aided Analysis of Engineering Tolerances
… components, it is essential that manufacturing tolerances should be analysed to make sure that assemblies fit together satisfactorily and that parts are not produced to unnecessarily tight specifications. The analysis may be divided into three stages: (a) calculation of the sensitivity of a …
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Using product tolerances to drive manufacturing system design
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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The automatic allocation of tolerances through cost optimization
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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A cost allocation approach to defining and specifying tolerances
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Relation between tolerances and distribution of two species of Ephemeroptera
In this study, tolerance limits for a number of environmental factors, taken both singly and in combination, have been determined in the laboratory for aquatic nymphs of two mayflies, Baetis harrisoni Barnard 1932 and Choroterpes (Euthraulus) bugandensis (Kimmins 1956). These limits have been …
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Defining Acceptable Colour Tolerances for Identity Branding in Natural Viewing Conditions
… of most brand communications. The reproduction tolerances in the graphic arts industry are based on standards that aim to produce visually acceptable outcomes. To communicate with their target audience brands, use a set of visual cues that may include the definition of a single or combinations …
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Sex-Based Differences in Calcaneal Injury Tolerances Under High-Rate Loading
In this experiment, average calcaneal fracture force is measured across male and female groups. The purpose of this experiment is an analysis of alternatives exploring the importance of sex-based criteria in models representing injuries typical in underbody blast environments. Seventeen (17) right …
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Physiological tolerances of high temperatures in Fynbos birds: implications for climate change
Climate change is a reality. Numerous biological systems have already responded to changes in climate, with range shifts towards higher latitudes and altitudes being one of the most common responses to climate warming. Bioclimatic envelope modelling provides a useful method for predicting a …
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The effect of manufacturing tolerances and header design on heat exchanger effectiveness
This study seeks to analyze the effect of manufacturing defects and inlet header design on the effectiveness of heat exchangers. A commercial computational fluid dynamics code, FLUENT 5.4, was used to numerically simulate individual and pairs of passages as well as sections of an inlet header and …
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Prediction of heat treatment distortion and optimization of manufacturing tolerances for machined components
1 PDF file (xvii, 178 pages)
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Modeling and verification methods for the inspection of geometric tolerances using point data
… of allowable variation in a part is specified by tolerances. To ensure a part conforms to these tolerances, inspection methods are required. With the increase demand for flexibility on the factory floor, a programmable inspection tool, known as the coordinate measuring machine (CMM), has become …
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Impact assessment for the MIT Research Reactor low enrichment uranium fuel fabrication tolerances
… proposed MITR LEU "FYT" fuel element fabrication tolerances on the operation and safety limits of the MITR. Therefore, the effects of fabrication specification parameters on all levels of the core, ranging from full-core alterations to individual spots on the fuel plates were analyzed. Evaluations …
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Thermal Tolerances of an Endemic Hot Spring Snail Physella wrighti Te and Clarke (Mollusca: Physidae)
Physella wrighti (Te and Clarke, 1985) is an Endangered freshwater snail endemic to the Liard Hot Springs in northern British Columbia. It inhabits water temperatures from 23.5oC to 36oC and is active year-round. Despite its conservation status, little else is known about this species. To advance …
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Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module
… to evaluate the impact of parametric device tolerances on electrical and thermal performance. Paralleling power devices increases current handling capability for the same bus voltage. However, inherent parametric differences among dies leads to unbalanced current sharing causing overstress …
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A response surface investigation of the larval tolerances of three spionid polychaetes to temperature, salinity and food concentration
… surface techniques were used to investigate the tolerances of the planktonic larvae of three spionid polychaetes to a variety of temperature and salinity combinations. Two of the spionids were morphologically very similar members of the genus Boccar.dia., B. proboscidea and B. columbiana which …
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Computational and experimental analysis of the effects of manufacturing tolerances on the performance of a regenerative liquid ring pump
… are dictated by the manufacturer’s drawing tolerances on critical pump components. The results of the parametric clearance analysis showed that there could be a potential variation in head performance by as much as 25%. Furthermore, it highlighted the need to experimentally test a number of …
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Stream invertebrates and water temperature : evaluating thermal tolerances in the Cape floristic region (South Africa) - implications of climate change
… very little information exists on the thermal tolerances of aquatic invertebrates in South Africa. In order to rectify this problem baseline data on thermal tolerances of aquatic species needs to be collected, together with stream temperature and associated invertebrate community data. An …
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Physiological aspects of relative changes in nitrogen and plant density stress tolerances over a 38-year period of US maize hybrid introductions
<p>Incremental gains in grain yield of maize hybrids over the decades are the consequence of genotype, environment and management interactions. Historically, genetic improvements in newer hybrids have included longer active grain filling periods (achieved by advancing silking and extending …
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