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.
Results
Showing 1 to 20 of 27 for “"process stability"”.
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Workpiece -Fixture Frictional Contact and Its Influence on Machining Performance
… model, it is possible to predict machining process stability by taking the workpiece-fixture interaction into account. Results from machining process stability showed that the machining stability is strongly influenced by the frictional contact and the incorporation of its influence allows …
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Monitoring and control of metal-based additive manufacturing technologies
… strategies for additive manufacturing (AM) processes. An arc-length control system and a PID temperature control system were developed for Wire-arc AM processes. An Oxygen monitoring/control system with a shielding gas crossflow was developed for Powder based fusion (PBF) processes. The …
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Reduction of process monitoring in semiconductor chip manufacturing
… monitoring (inspections) in the manufacturing process. While the inspections help safeguard process stability and boost manufacturing yield, they also account for a substantial fraction of the company's variable manufacturing costs. Intel is under pressure to cut inspections as a means of …
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Reactor design for the hydroxylation of n-octane using a cyp153a6-based biocatalytic system expressed in Escherichia coli
… the global expansion of gas-to-liquid refining processes. Furthermore, these linear alkanes feature one of the strongest chemical bonds in nature and typically are of a low value due to their inertness. In an effort to valorise this resource, catalytic routes are being sought in order to improve …
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Enhancing machine availability in plastic SMEs through lean and TPM: evidence from a peruvian case study
… improvements enhanced production capacity and process stability, demonstrating the model's effectiveness in reducing unplanned stoppages. This study contributes to the body of knowledge by providing a replicable framework for optimizing manufacturing processes in plastic SMEs, suggesting …
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Managing preventative maintenance activities at Intel Corporation
… maintenance (PM) activities can provide process stability and increased throughput if scheduled and executed efficiently. This thesis evaluates the benefits of coordinating PMs among functional areas and the effectiveness of existing PM practices at a 24 hours per day, 7 days per week …
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Evaluation and continuous improvement of foodborne disease surveillance.
… disease outbreak detection and investigation process. This thesis is the results of investigation into the three following research questions: 1) can foodborne disease outbreak responder training and work experience be measured in an electronic survey, 2) what is the performance of the …
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Computational Intelligence Techniques for Control and Optimization of Wastewater Treatment Plants
… to improve energy efficiency, while guaranteeing process stability and maintenance of high cleaning capacity, has become a priority for WWTP operators due to increasing treatment costs. To achieve these ambitious and even contradictory objectives, this thesis investigates a combination of online …
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A Trusted Autonomic Architecture to Safeguard Cyber-Physical Control Leaf Nodes and Protect Process Integrity
… and susceptible to malware. Threats targeting process control are much more safety-critical than traditional computing systems since they jeopardize the integrity of physical infrastructure. Existing defence mechanisms address security at the network nodes but do not protect the physical …
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A robust Shewhart control chart adjustment strategy
… standard Shewhart control chart for monitoring process stability is generalized by selecting a point in time at which the distance between the control limits is reduced. Three cost models are developed to describe the total cost per unit time of monitoring the mean of a process using both the …
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Evaluating strategies for integrating bacterial cells into a biosensor designed to detect electrophilic toxins
To improve the process stability of wastewater treatment plants, the construction of a whole-cell bacterial biosensor is explored to harness the natural stress response of the bacterial cells. The stress response selected in this work is the glutathione-gated potassium efflux (GGKE) system, which …
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Surface transfer doping of diamond for power electronics
… WO₃ in conjunction with the novel contact-first process explored in this work shows great promise on advancing process stability while attaining the high current densities desired in the future of power diamond transistors. We closely examine the H-terminated diamond/TMO interface using a …
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Enhanced Structure and Crystallinity of Semiconducting Polymer Films Through Electrospray Deposition
… monodisperse droplet size distribution, good stability and scalability. Electrospray is a bottom-up deposition method which opens up the possibility of a roll-to-roll compatible process and is functional at regular atmospheric conditions. Due to this set of positive qualities, this atomization …
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Discrete-time Contraction Analysis and Controller Design for Nonlinear Processes
… the traditional mass production approach, the process industry is moving towards more agile, cost-effective and dynamic process operation (next-generation smart plants). This warrants the development of control systems for nonlinear chemical processes to be capable of tracking time-varying …
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Aerosol carbon nanotube production via scalable microplasma synthesis of catalyst nanoparticles
… (FC-CVD) has emerged as the most promising process for large-scale production with an increasing number of commercial uses. Yet, FC-CVD still requires improvements in control (i.e., reliability and CNT size) and quality (i.e., defects and impurities) to overcome the current trade-off between …
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Weak acid/bases and pH control in upflow anaerobic sludge bed reactors
… when treated in UASB systems, (2) monitoring process stability when treating these wastes under different operating conditions, e.g. different recycle ratios. • Assessment of H₂CO₃*alkalinity requirements for Iauter tun (brewery) waste to maintain a near neutral minimum bed pH in UASB systems. …
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Development of Cu particle sintering as die attach solution for high temperature electronics applications
… α-brass flakes using hydrochloric acid (HCl), a process known as dezincification, which creates surface modifications that enhance material transport during sintering. Polyethylene glycol 600 (PEG600) is incorporated as an organic binder to reduce Cu and Ag oxides in-situ, enabling effective …
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An analytical study of the ethical problems in India’s digital service sector and their impact on attrition in the IT industry
… factors in DSS, such as trust, decision-making process, stability, and day to day activities of the individuals in the workplace. This research focuses on the ethical issues in India’s DSS as it exhibits a high staff attrition rate. India is the second largest populated country in the world and …
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Stoichiometry and kinetic modeling of an anaerobic baffled reactor, The
… is centered around aerobic biological treatment processes. The aerobic treatment of wastewater requires a substantial energy input, while effectively wasting a significant portion of the potential chemical energy found in the raw wastewater. This energy intensive process is perpetuated downstream …
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Anaerobic digestion of catering wastes
… addresses gaps in current knowledge regarding process issues associated<br/>with long term semi-continuous digestion of food waste as a sole substrate, and the role of<br/>trace elements and biomass retention in digestion of food wastes.<br/><br/>Source segregated food wastes were collected …
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