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 21 for “"One factor -at-a time"”.
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Ensembles of Adaptive One-Factor at-a-Time experiments : methods, evaluation, and theory
This thesis recommends an experimentation methodology which can be used to improve systems, processes and products. The proposed technique borrows insights from statistical prediction practices referred to as Ensemble Methods, to extend Adaptive One-Factor-at-a-Time (aOFAT) experimentation. The …
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Assessment of adaptive one-factor-at-a-time method vs. fractional factorial methods using reconfigurable paper aircraft
Recent research has suggested that under certain conditions, adaptive one-factor-at-a-time (aOFAT) methods outperform more commonly used fractional factorial methods. This study sought to corroborate these claims by analyzing a case study of a real-life experiment. A full factorial experiment was …
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Analysis of land use and land cover change and its impact on soil erosion in Nzhelele Valley, Limpopo Province, South Africa
Globally, the rate of land use and land cover changes has affeceted the magnitude of soil eroion. Strategies to combat soil erosion can give assistance as solutions to provide food security in many agricultural areas. Although some changes are caused by natural factors, anthropogenic factors and an …
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Investigating the fine milling of pigment in a colourant formulation on the Bühler PML2 Superflow mill
… mills remain the most suitable option in the coatings industry for the ultrafine grinding of colourants. The fineness of grind and colourant tint strength are typically used as indicators for the end of a production run during colourant manufacturing. These typical parameters from the coatings …
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Human detection of computer simulation mistakes in engineering experiments
This thesis investigates the notion that the more complex the experimental plan, the less likely an engineer is to discover a simulation mistake in a computer-based experiment. The author used an in vitro methodology to conduct an experiment with 54 engineers completing a design task to find the …
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Some optimization procedures used in response surface methodology
This thesis is a literature survey into selected optimization topics of response surface methodology. In a typical response surface problem one of the main problems to be solved is to find those levels of the controllable variables to provide an optimum response such as highest yield or lowest …
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Functional Anova Models With Application to Corporate Bonds
… four different approaches for resampling data under the null hypothesis of no effect of the factors. They include bootstrapping method with two separate resampling approaches: resampling residuals at each time point; and resampling residuals curves. The other approaches were permutation …
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Sequential optimization through adaptive design of experiments
… of discrete design space, I propose an adaptive One-Factor-at-A-Time (OFAT) experimental design, study its properties and compare its performance to saturated fractional factorial designs. The rationale for adopting the adaptive OFAT design scheme become clear if it is imbedded in a Bayesian …
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Facing reality : design and management of flexible engineering systems
… to defining flexible design and development strategies for maximizing the expected value of engineering systems. Specifically, the approach deals with the fact that it is generally computationally impractical to explore all the possible ways a system might be developed and operated, given the …
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The addition of a calender machine to a pyrolytic graphite sheet production plant
… of adding a new calender machine to AvCarb Material Solutions' pyrolytic graphite production plant. Before the machine could be used for mass production, several experiments needed to be conducted to better understand the capabilities of the machine. A process control procedure was designed …
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A screening model to explore planning decisions in automotive manufacturing systems under demand uncertainty
… investment and resources for systems configuration. Furthermore, these systems operate in environments that are constantly changing due to shifts in macroeconomic, market demand and regulations, which can significantly influence systems' performance. It is often very difficult or prohibitively …
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The thermal energy performance of domestic dwellings in the UK
… studies in a whole house test facility in a climate controlled chamber, which has allowed for work to be undertaken that challenges the existing assumptions within regulatory steady state models, such as the Standard Assessment Procedure, something that is not easily undertaken in field-based and …
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Coarse Particle Flotation of Coarse Gold and Gold-bearing Ore by Fluidized-bed-flotation
The froth flotation process has been the most widely used mineral concentration technique for more than a century. However, neither flotation columns nor conventional flotation cells are efficient in processing coarse mineral-bearing particles. Most sulfide mineral particles, above a particle size …
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Poly (2,6-dimethyl-1,4-phenylene oxide) hollow fibres for gas separation.
Hollow fibres used for gas separation applications need to have good mechanical strength and excellent gas separation properties. The production of hollow fibres by the dry-wet spinning process involves many variables, each having the potential to affect these properties. This is a systematic study …
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New composite coagulant from agro-waste (tapioca peel) and polyaluminium chloride for primary landfill leachate treatment
Coagulation-flocculation is one of the applications that work efficiently for stabilised leachate treatment, alongside the utilisation of chemical coagulants. On the contrary, the use of chemical coagulants has certain drawbacks towards the health of the ecosystem and living organisms. Hence, this …
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Promoting material circularity in pulp and paper mills: organic-inorganic cellulosic composites for slow-release of nutrients
The pulp and paper industry generates large quantities of waste, while the forestry sector experiences economic and environmental challenges with commercial fertilisers. Slow/controlled-release fertilisers (SCRFs) offer an opportunity to repurpose waste-stream materials and improve nutrient …
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Investigations into the determination of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) by capillary gas chromatography
Factors involved in the determination of PAHs (16 priority PAHs as an example) and PCBs (10 PCB congeners, representing 10 isomeric groups) by capillary gas chromatography coupled with mass spectrometry (GC/MS, for PAHs) and electron capture detection (GC/ECD , for PCBs) were studied, with emphasis …
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Promoting pulp and paper mill material circularity: functionalised organic-inorganic cellulosic mulch films
Water scarcity, fertiliser run-off, and weeds competing for resources reduce forestry and agricultural productivity. Conventionally, fossil-fuel-based synthetic mulch films have been used to mitigate soil water loss, as a matrix for the slow-release of fertiliser, and for UV-vis light blocking to …
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On the effects of hydrological uncertainty in assessing the impacts of climate change on water resources
This dissertation focuses on the assessment of projected changes on water resources by the end of this century (2071-2100), considering an ensemble of high resolution future climate scenarios, the effects of hydrological parameterisation, and the bias of the hydrological model in representing …
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The synthesis of calcium phosphate from municipal wastewater and its application for the removal of metals from acidic effluents
The contamination of the environment with wastewaters emanating from different operations and industrial activities has been an issue of prime concern to national and international research communities. Grossly, acid mine drainage (AMD) and municipal wastewater (MWW) are the most common waste …
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