Dissertations / Theses on the topic 'Theory of computation not elsewhere classified'
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Zhu, Huaiyu. "Neural networks and adaptive computers : theory and methods of stochastic adaptive computation." Thesis, University of Liverpool, 1993. http://eprints.aston.ac.uk/365/.
Full textLaverick, Craig. "Enforcing the ISM Code, and improving maritime safety, with an improved Corporate Manslaughter Act : a safety culture theory perspective." Thesis, University of Central Lancashire, 2018. http://clok.uclan.ac.uk/23768/.
Full textOliver, Christine. "Systemic reflexivity : building theory for organisational consultancy." Thesis, University of Bedfordshire, 2012. http://hdl.handle.net/10547/567099.
Full textEdmonds, Andrew Nicola. "Time series prediction using supervised learning and tools from chaos theory." Thesis, University of Bedfordshire, 1996. http://hdl.handle.net/10547/582141.
Full text(9805715), Zhigang Huang. "A recursive algorithm for reliability assessment in water distribution networks with applications of parallel programming techniques." Thesis, 1994. https://figshare.com/articles/thesis/A_recursive_algorithm_for_reliability_assessment_in_water_distribution_networks_with_applications_of_parallel_programming_techniques/13425371.
Full text(9831926), David Ruxton. "Differential dynamic programming and optimal control of inequality constrained continuous dynamic systems." Thesis, 1991. https://figshare.com/articles/thesis/Differential_dynamic_programming_and_optimal_control_of_inequality_constrained_continuous_dynamic_systems/13430081.
Full text(9811760), Scott Ladley. "An investigation into the application of evolutionary algorithms on highly constrained optimal control problems and the development of a graphical user interface for comprehensive algorithm control and monitoring." Thesis, 2003. https://figshare.com/articles/thesis/An_investigation_into_the_application_of_evolutionary_algorithms_on_highly_constrained_optimal_control_problems_and_the_development_of_a_graphical_user_interface_for_comprehensive_algorithm_control_and_monitoring/19930160.
Full textIn this thesis we investigate how intelligent techniques, such as Evolutionary Algorithms, can be applied to finding solutions to discrete optimal control problems. Also, a detailed investigation is carried out into the design and development of a superior execution environment for Evolutionary Algorithms.
An overview of the basic processes of an Evolutionary Algorithm is given, as well as detailed descriptions for several genetic operators. Several additional operators that may be applied in conjunction with an Evolutionary Algorithm are also studied. These operators include several versions of the simplex method, as well as 3 distinct hill -climbers, each designed for a specific purpose. The hill -climbing routines have been designed for purposes that include local search, escaping local minima, and a hill -climbing routine designed for self -adaptation to a broad range of problems.
The mathematical programming formulation of discrete optimal control problems is used to generate a class of highly constrained problems. Techniques are developed to accurately and rapidly solve these problems, whilst satisfying the equality constraints to machine accuracy.
The improved execution environment for Evolutionary Algorithms proposes the use of a Graphical User Interface for data visualisation, algorithm control and monitoring, as well as a Client/Server network interface for connecting the GUI to remotely run algorithms.
Nguyen, Van-Tuong. "An implementation of the parallelism, distribution and nondeterminism of membrane computing models on reconfigurable hardware." 2010. http://arrow.unisa.edu.au:8081/1959.8/100802.
Full textThesis (PhDInformationTechnology)--University of South Australia, 2010
(10514360), Uttara Vinay Tipnis. "Data Science Approaches on Brain Connectivity: Communication Dynamics and Fingerprint Gradients." Thesis, 2021.
Find full text(8713962), James Ulcickas. "LIGHT AND CHEMISTRY AT THE INTERFACE OF THEORY AND EXPERIMENT." Thesis, 2020.
Find full text(6012225), Huian Li. "Transparent and Mutual Restraining Electronic Voting." Thesis, 2019.
Find full text(9776870), Jeanne Allen. "The "theory-practice gap": Turning theory into practice in a pre-service teacher education program." Thesis, 2009. https://figshare.com/articles/thesis/The_theory-practice_gap_Turning_theory_into_practice_in_a_pre-service_teacher_education_program/13455275.
Full text(5930264), Arthur J. Shih. "Synthesis and Characterization of Copper-Exchanged Zeolite Catalysts and Kinetic Studies on NOx Selective Catalytic Reduction with Ammonia." 2019.
Find full textAlthough Cu-SSZ-13 zeolites are used commercially in diesel engine exhaust after-treatment for abatement of toxic NOx pollutants via selective catalytic reduction (SCR) with NH3, molecular details of its active centers and mechanistic details of the redox reactions they catalyze, specifically of the Cu(I) to Cu(II) oxidation half-reaction, are not well understood. A detailed understanding of the SCR reaction mechanism and nature of the Cu active site would provide insight into their catalytic performance and guidance on synthesizing materials with improved low temperature (< 473 K) reactivity and stability against deactivation (e.g. hydrothermal, sulfur oxides). We use computational, titration, spectroscopic, and kinetic techniques to elucidate (1) the presence of two types of Cu2+ ions in Cu-SSZ-13 materials, (2) molecular details on how these Cu cations, facilitated by NH3 solvation, undergo a reduction-oxidation catalytic cycle, and (3) that sulfur oxides poison the two different types of Cu2+ ions to different extents at via different mechanisms.
Copper was exchanged onto H-SSZ-13 samples with different Si:Al ratios (4.5, 15, and 25) via liquid-phase ion exchange using Cu(NO3)2 as the precursor. The speciation of copper started from the most stable Cu2+ coordinated to two anionic sites on the zeolite framework to [CuOH]+ coordinated to only one anionic site on the zeolite framework with increasing Cu:Al ratios. The number of Cu2+ and [CuOH]+ sites was quantified by selective NH3 titration of the number of residual Brønsted acid sites after Cu exchange, and by quantification of Brønsted acidic Si(OH)Al and CuOH stretching vibrations from IR spectra. Cu-SSZ-13 with similar Cu densities and anionic framework site densities exhibit similar standard SCR rates, apparent activation energies, and orders regardless of the fraction of Z2Cu and ZCuOH sites, indicating that both sites are equally active within measurable error for SCR.
The standard SCR reaction uses O2 as the oxidant (4NH3 + 4NO + O2 -> 6H2O + 4N2) and involves a Cu(I)/Cu(II) redox cycle, with Cu(II) reduction mediated by NO and NH3, and Cu(I) oxidation mediated by NO and O2. In contrast, the fast SCR reaction (4NH3 + 2NO + 2NO2 -> 6H2O + 4N2) uses NO2 as the oxidant. Low temperature (437 K) standard SCR reaction kinetics over Cu-SSZ-13 zeolites depend on the spatial density and distribution of Cu ions, varied by changing the Cu:Al and Si:Al ratio. Facilitated by NH3 solvation, mobile Cu(I) complexes can dimerize with other Cu(I) complexes within diffusion distances to activate O2, as demonstrated through X-ray absorption spectroscopy and density functional theory calculations. Monte Carlo simulations are used to define average Cu-Cu distances. In contrast with O2-assisted oxidation reactions, NO2 oxidizes single Cu(I) complexes with similar kinetics among samples of varying Cu spatial density. These findings demonstrate that low temperature standard SCR is dependent on Cu spatial density and requires NH3 solvation to mobilize Cu(I) sites to activate O2, while in contrast fast SCR uses NO2 to oxidize single Cu(I) sites.
We also studied the effect of sulfur oxides, a common poison in diesel exhaust, on Cu-SSZ-13 zeolites. Model Cu-SSZ-13 samples exposed to dry SO2 and O2 streams at 473 and 673 K. These Cu-SSZ-13 zeolites were synthesized and characterized to contain distinct Cu active site types, predominantly either divalent Cu2+ ions exchanged at proximal framework Al sites (Z2Cu), or monovalent CuOH+ complexes exchanged at isolated framework Al sites (ZCuOH). On the model Z2Cu sample, SCR turnover rates (473 K, per Cu) catalyst decreased linearly with increasing S content to undetectable values at equimolar S:Cu molar ratios, while apparent activation energies remained constant at ~65 kJ mol-1, consistent with poisoning of each Z2Cu site with one SO2-derived intermediate. On the model ZCuOH sample, SCR turnover rates also decreased linearly with increasing S content, yet apparent activation energies decreased monotonically from ~50 to ~10 kJ mol-1, suggesting that multiple phenomena are responsible for the observed poisoning behavior and consistent with findings that SO2 exposure led to additional storage of SO2-derived intermediates on non-Cu surface sites. Changes to Cu2+ charge transfer features in UV-Visible spectra were more pronounced for SO2-poisoned ZCuOH than Z2Cu sites, while X-ray diffraction and micropore volume measurements show evidence of partial occlusion of microporous voids by SO2-derived deposits, suggesting that deactivation may not only reflect Cu site poisoning. Density functional theory calculations are used to identify the structures and binding energies of different SO2-derived intermediates at Z2Cu and ZCuOH sites. It is found that bisulfates are particularly low in energy, and residual Brønsted protons are liberated as these bisulfates are formed. These findings indicate that Z2Cu sites are more resistant to SO2 poisoning than ZCuOH sites, and are easier to regenerate once poisoned.
(11205636), Sarah B. Percival. "Efficient Computation of Reeb Spaces and First Homology Groups." Thesis, 2021.
Find full text(9834218), Julie Shaw. "Constructing a grounded theory of young adult health literacy." Thesis, 2017. https://figshare.com/articles/thesis/Constructing_a_grounded_theory_of_young_adult_health_literacy/13443047.
Full text(7307489), Ishant Khurana. "Catalytic Consequences of Active Site Speciation, Density, Mobility and Stability on Selective Catalytic Reduction of NOx with Ammonia over Cu-Exchanged Zeolites." Thesis, 2019.
Find full textSelective catalytic reduction (SCR) of NOx using NH3 as a reductant (4NH3+ 4NO + O2 6H2O + 4N2) over Cu-SSZ-13 zeolites is a commercial technology used to meet emissions targets in lean-burn and diesel engine exhaust. Optimization of catalyst design parameters to improve catalyst reactivity and stability against deactivation (hydrothermal and sulfur poisoning) necessitates detailed molecular level understanding of structurally different active Cu sites and the reaction mechanism. With the help of synthetic, titrimetric, spectroscopic, kinetic and computational techniques, we established new molecular level details regarding 1) active Cu site speciation in monomeric and dimeric complexes in Cu-SSZ-13, 2) elementary steps in the catalytic reaction mechanism, 3) and deactivation mechanisms upon hydrothermal treatment and sulfur poisoning.
We have demonstrated that Cu in Cu-SSZ-13 speciates as two distinct isolated sites, nominally divalent CuII and monovalent [CuII(OH)]+ complexes exchanged at paired Al and isolated Al sites, respectively. This Cu site model accurately described a wide range of zeolite chemical composition, as evidenced by spectroscopic (Infrared and X-ray absorption) and titrimetric characterization of Cu sites under ex situ conditions and in situ and operando SCR reaction conditions. Monovalent [CuII(OH)]+ complexes have been further found to condense to form multinuclear Cu-oxo complexes upon high temperature oxidative treatment, which have been characterized using UV-visible spectroscopy, CO-temperature programmed reduction and dry NO oxidation as a probe reaction. Structurally different isolated Cu sites have different susceptibilities to H2 and He reductions, but are similarly susceptible to NO+NH3 reduction and have been found to catalyze NOx SCR reaction at similar turnover rates (per CuII; 473 K) via a CuII/CuI redox cycle, as their structurally different identities are masked by NH3 solvation during reaction.
Molecular level insights on the low temperature CuII/CuI redox mechanism have been obtained using experiments performed in situand in operando coupled withtheory. Evidence has been provided to show that the CuII to CuI reduction half-cycle involves single-site Cu reduction of isolated CuII sites with NO+NH3, which is independent of Cu spatial density. In contrast, the CuI to CuII oxidation half-cycle involves dual-site Cu oxidation with O2 to form dimeric Cu-oxo complexes, which is dependent on Cu spatial density. Such dual-site oxidation during the SCR CuII/CuI redox cycle requires two CuI(NH3)2sites, which is enabled by NH3solvation that confers mobility to isolated CuI sites and allows reactions between two CuI(NH3)2 species and O2. As a result, standard SCR rates depend on Cu proximity in Cu-SSZ-13 zeolites when CuI oxidation steps are kinetically relevant. Additional unresolved pieces of mechanism have been investigated, such as the reactivity of Cu dimers, the types of reaction intermediates involved, and the debated role of Brønsted acid sites in the SCR cycle, to postulate a detailed reaction mechanism. A strategy has been discussed to operate either in oxidation or reduction-limited kinetic regimes, to extract oxidation and reduction rate constants, and better interpret the kinetic differences among Cu-SSZ-13 catalysts.
The stability of active Cu sites upon sulfur oxide poisoning has been assessed by exposing model Cu-zeolite samples to dry SO2 and O2 streams at 473 and 673 K, and then analyzing the surface intermediates formed via spectroscopic and kinetic assessments. Model Cu-SSZ-13 zeolites were synthesized to contain distinct Cu active site types, predominantly either divalent CuII ions exchanged at proximal framework Al (Z2Cu), or monovalent [CuIIOH]+ complexes exchanged at isolated framework Al (ZCuOH). SCR turnover rates (473 K, per Cu) decreased linearly with increasing S content to undetectable values at equimolar S:Cu ratios, consistent with poisoning of each Cu site with one SO2-derived intermediate. Cu and S K-edge X-ray absorption spectroscopy and density functional theory calculations were used to identify the structures and binding energies of different SO2-derived intermediates at Z2Cu and ZCuOH sites, revealing that bisulfates are particularly low in energy, and residual Brønsted protons are liberated at Z2Cu sites as bisulfates are formed. Molecular dynamics simulations also show that Cu sites bound to one HSO4- are immobile, but become liberated from the framework and more mobile when bound to two HSO4-. These findings indicate that Z2Cu sites are more resistant to SO2poisoning than ZCuOH sites, and are easier to regenerate once poisoned.
The stability of active Cu sites on various small-pore Cu-zeolites during hydrothermal deactivation (high temperature steaming conditions) has also been assessed by probing the structural and kinetic changes to active Cu sites. Three small-pore, eight-membered ring (8-MR) zeolites of different cage-based topology (CHA, AEI, RTH) have been investigated. With the help of UV-visible spectroscopy to probe the Cu structure, in conjunction with measuring differential reaction kinetics before and after subsequent treatments, it has been suggested that the RTH framework imposes internal transport restrictions, effectively functioning as a 1-D framework during SCR catalysis. Hydrothermal aging of Cu-RTH results in complete deactivation and undetectable SCR rates, despite no changes in long-range structure or micropore volume after hydrothermal aging treatments and subsequent SCR exposure, highlighting beneficial properties conferred by double six-membered ring (D6R) composite building units. Exposure aging conditions and SCR reactants resulted in deleterious structural changes to Cu sites, likely reflecting the formation of inactive copper-aluminate domains. Therefore, the viability of Cu-zeolites for practical low temperature NOx SCR catalysis cannot be inferred solely from assessments of framework structural integrity after aging treatments, but also require Cu active site and kinetic characterization after aged zeolites are exposed to low temperature SCR conditions.
(9846839), Sandra Worsley. "A foot in both camps: A constructivist grounded theory study exploring the experience of nurses who became homeopaths." Thesis, 2020. https://figshare.com/articles/thesis/A_foot_in_both_camps_A_constructivist_grounded_theory_study_exploring_the_experience_of_nurses_who_became_homeopaths/13411316.
Full text(11178198), Harrison Wong. "K-theory of certain additive categories associated with varieties." Thesis, 2021.
Find full text(9845663), Leonie Williams. "What needs? Nurses and Aboriginal patients in hospital. A grounded theory study." Thesis, 1999. https://figshare.com/articles/thesis/What_needs_Nurses_and_Aboriginal_patients_in_hospital_A_grounded_theory_study/13424732.
Full text(9833828), Brian Sengstock. "A grounded theory study of nursing students' experiences in the off-campus clinical setting." Thesis, 2009. https://figshare.com/articles/thesis/A_grounded_theory_study_of_nursing_students_experiences_in_the_off-campus_clinical_setting/13425191.
Full text(5930132), Francisco J. Pena. "Efficient Computation of Accurate Seismic Fragility Functions Through Strategic Statistical Selection." Thesis, 2019.
Find full text(9777596), Judith Applegarth. "Understanding Assisted Reproductive Technology nursing (ART) practice in Australia: A grounded theory study." Thesis, 2011. https://figshare.com/articles/thesis/Understanding_Assisted_Reproductive_Technology_nursing_ART_practice_in_Australia_A_grounded_theory_study/13464605.
Full text(7041383), Carl J. Olthoff. "Computation of Large Displacement Stability Metrics in DC Power Systems." Thesis, 2019.
Find full text(9844157), Anthony Weber. "Morphine administration by paramedics: An application of the theory of planned behaviour." Thesis, 2014. https://figshare.com/articles/thesis/Morphine_administration_by_paramedics_An_application_of_the_theory_of_planned_behaviour/13387235.
Full text(5930021), Paulami Majumdar. "Density Functional Theory Investigations of Metal/Oxide Interfaces and Transition Metal Catalysts." Thesis, 2021.
Find full text(9828500), Kylie Radel. "The Dreamtime Cultural Centre: A grounded theory of doing business in an Indigenous tourism enterprise." Thesis, 2010. https://figshare.com/articles/thesis/The_Dreamtime_Cultural_Centre_A_grounded_theory_of_doing_business_in_an_Indigenous_tourism_enterprise/13459751.
Full text(9804593), Pamela Hogan. "Registered nurse understanding of organisational commitment and its link to retention: A grounded theory study." Thesis, 2012. https://figshare.com/articles/thesis/Registered_nurse_understanding_of_organisational_commitment_and_its_link_to_retention_A_grounded_theory_study/13464893.
Full text(11178675), Reza Soltani. "COLLISION AVOIDANCE FOR AUTOMATED VEHICLES USING OCCUPANCY GRID MAP AND BELIEF THEORY." Thesis, 2021.
Find full text(9838145), Nadia O'Connell. "Exploring the role of relationship marketing between universities and education agents: A case study analysis." Thesis, 2012. https://figshare.com/articles/thesis/Exploring_the_role_of_relationship_marketing_between_universities_and_education_agents_A_case_study_analysis/13457729.
Full text(8082827), Kuang-Chung Wang. "METHOD DEVELOPMENT IN THE NEGF FRAMEWORK: MAXIMALLY LOCALIZED WANNIER FUNCTION AND BÜTTIKER PROBE FOR MULTI-PARTICLE INTERACTION." Thesis, 2019.
Find full text(9165011), Salar Safarkhani. "GAME-THEORETIC MODELING OF MULTI-AGENT SYSTEMS: APPLICATIONS IN SYSTEMS ENGINEERING AND ACQUISITION PROCESSES." Thesis, 2020.
Find full textThe process of acquiring the large-scale complex systems is usually characterized with cost and schedule overruns. To investigate the causes of this problem, we may view the acquisition of a complex system in several different time scales. At finer time scales, one may study different stages of the acquisition process from the intricate details of the entire systems engineering process to communication between design teams to how individual designers solve problems. At the largest time scale one may consider the acquisition process as series of actions which are, request for bids, bidding and auctioning, contracting, and finally building and deploying the system, without resolving the fine details that occur within each step. In this work, we study the acquisition processes in multiple scales. First, we develop a game-theoretic model for engineering of the systems in the building and deploying stage. We model the interactions among the systems and subsystem engineers as a principal-agent problem. We develop a one-shot shallow systems engineering process and obtain the optimum transfer functions that best incentivize the subsystem engineers to maximize the expected system-level utility. The core of the principal-agent model is the quality function which maps the effort of the agent to the performance (quality) of the system. Therefore, we build the stochastic quality function by modeling the design process as a sequential decision-making problem. Second, we develop and evaluate a model of the acquisition process that accounts for the strategic behavior of different parties. We cast our model in terms of government-funded projects and assume the following steps. First, the government publishes a request for bids. Then, private firms offer their proposals in a bidding process and the winner bidder enters in a con- tract with the government. The contract describes the system requirements and the corresponding monetary transfers for meeting them. The winner firm devotes effort to deliver a system that fulfills the requirements. This can be assumed as a game that the government plays with the bidder firms. We study how different parameters in the acquisition procedure affect the bidders’ behaviors and therefore, the utility of the government. Using reinforcement learning, we seek to learn the optimal policies of involved actors in this game. In particular, we study how the requirements, contract types such as cost-plus and incentive-based contracts, number of bidders, problem complexity, etc., affect the acquisition procedure. Furthermore, we study the bidding strategy of the private firms and how the contract types affect their strategic behavior.
(10676241), Stacy Lynn Walker. "Connecting Through Communication: Scripts Enacting Three Theories." 2021.
Find full text(9875528), DP Irwin. "Evaluation of water quality monitoring networks using the concept of information entropy." Thesis, 1996. https://figshare.com/articles/thesis/Evaluation_of_water_quality_monitoring_networks_using_the_concept_of_information_entropy/13425992.
Full text(6632552), Heather A. W. Cann. "BEYOND THE CLIMATE SCIENCE WARS: ELITE FRAMING AND CLIMATE CHANGE POLICY CONFLICT." Thesis, 2019.
Find full text(3436478), Brigid Lynch. "Implementing skin cancer screening clinics in a rural community: A case study of diffusion theory." Thesis, 2001. https://figshare.com/articles/thesis/Implementing_skin_cancer_screening_clinics_in_a_rural_community_A_case_study_of_diffusion_theory/20022704.
Full textSkin cancer screening clinics were introduced into a number of towns throughout Queensland as part of the Melanoma Screening Trial (MST), a study investigating the efficacy of screening for melanoma. The MST requires 60% of these towns' populations aged over 30 years to be screened for
melanoma within a three year intervention phase. The aim of this case study is to assess the relationship between Rogers' (1995) diffusion of innovations and the health promotion strategies implemented to encourage attendance at skin cancer screening clinics.
Data were obtained from a number of sources, including administrative files, progress reports, interviews and focus groups and were positioned within a comparative theory/practice matrix. Pattern matching logic was used to
assess the relationship between the health promotion strategies and the theoretical construct of diffusion of innovations.
All components of diffusion of innovations (Rogers, 1995) were addressed by the health promotion strategies encouraging attendance at the skin cancer screening clinics. The delivery of the skin cancer screening clinics was in accordance with principles identified by past diffusion research. The skin cancer screening clinics conformed to most predictors of diffusion success and were delivered within a "real" environment, as suggested by past community -based interventions. A number of changes to existing health promotion strategies and the addition of some new strategies have been suggested to improve the rate of diffusion of skin cancer screening clinics in
the future.