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 20 for “"PARAFAC"”.
-
Dissolved organic material in groundwater and application of fluorescence spectroscopy coupled with EEM PARAFAC models as a means of site characterisation
… setting. Parallel factor analysis (PARAFAC) models were developed for each data set, with results compared to a model developed using all site data. This stage of the research demonstrated the potential to characterise groundwater environments based on character and concentration of …
-
Fluorescence Based Approach to Drinking Water Treatment Plant Natural Organic Matter (NOM) Characterization, Treatment, and Management
… and after coagulation. Parallel factor analysis (PARAFAC) was applied in order to generate independent models on different subsets of each drinking water treatment plant (DWTP) data set: (i) raw water, (ii) treated water, (iii) composite data set (i.e., raw and treated water), and (iv) …
-
Synergy of Alum and Chlorine Dioxide for Curbing Disinfection Byproduct Formation Potential at Central Arkansas Water
… In this study, fluorescence parallel factor (PARAFAC) analysis was combined with free chlorine simulated distribution system (SDS) tests and DBP formation potential (DBPFP) tests to study the benefit of chlorine dioxide primary disinfection (CDPD) with alum coagulation. Of the DBPs screened, …
-
Spatio-temporal characterization of a complete algal bloom event using fluorescence spectroscopy in tandem with conventional physico-chemical methods
… and with Parallel Factor Analysis (PARAFAC). Two peaks were identified visually: Peak C and Peak T. PARAFAC identified three fluorescence components with compound peaks. Component 1 had Peak A and Peak C1, component 2 had Peak A and Peak C2, and Component 3 had Peak T1 and Peak T2. …
-
Ensuring analytical quality in regulated markets through multivariate, multiway and DoE strategies
… con técnicas multivía como las descomposiciones PARAFAC y PARAFAC2 demuestran a lo largo de esta tesis su idoneidad para aumentar la exactitud, sensibilidad, especificidad y robustez de procedimientos multirresiduo basados en espectroscopía o en cromatografía acoplada a espectrometría de masas …
-
Straight pipes and household wastewater discharges into the rural Alabama and impact on watershed water quality with wetland land-uses
… matrixes (EEMs) Parallel Factor Analysis (PARAFAC) was used to identify and classify fluorescence emitting organic substances based on fluorescence peak location. Three fluorescence components, terrestrial humic-like, microbial humic-like, and protein-like fluorophores were identified using …
-
CONVERGENGE ANALYSIS ON SVD-BASED ALGORITHMS FOR TENSOR LOW RANK APPROXIMATIONS
… problem of finding the best rank-R CANDECOMP/PARAFAC(CP) approximation with diff erent cases R > 1 and R = 1 respectively. Unlike the rank-1 approximation is theoretically guaranteed to have a global optimum, general rank-R approximation (R > 1) may not exist in real space. So, there should be …
-
Estrategias quimiométricas aplicadas a técnicas cromatográficas para el análisis de monómeros y aditivos
… herramientas quimiométricas multivariantes (PARAFAC, PARAFAC2, diseños D-óptimos, frente Pareto, algoritmos genéticos, coordenadas paralelas) para obtener la información útil contenida en la ingente cantidad de datos que se obtiene en cada análisis cromatográfico.
-
Parallel factor analysis of gait waveform data: a multimode extension of principal component analysis
… gait data via Parallel Factor Analysis (Parafac), which is a component analysis model designed for three- or higher-mode data. Using three-mode joint angle waveform data (subjects × time × joints), we demonstrate Parafac’s ability to (a) determine interpretable components revealing the …
-
Examining cranial cruciate ligament deficiency and its effect on canine gait using Parafac2
… aspect relevant to the chosen condition. Parafac and Parafac2 have been successfully applied to three- and four-mode gait waveform data. Whereas previous Parafac2 analyses used experimental gait data, this study presents a successful application to cranial cruciate ligament (CCL) deficient …
-
Assessing Biofiltration without Ozonation for Removal of Trihalomethane Precursors in Drinking Water at the Beaver Water District Drinking Water Treatment Plant
… absorbance (SUVA254) and fluorescence-PARAFAC components – were measured weekly throughout the 30-week study to assess their suitability to track DBP precursor removal. RSSCTs containing DOC-exhausted granular activated carbon (GAC) removed up to 25% of the DOC with removal increasing …
-
Advanced Topics in Introductory Statistics
… derived using parallel factor analysis (PARAFAC) and it performs favorably in two source apportionment tasks.</p>
-
Tensor factorization in civil infrastructure systems
… techniques namely Tucker decomposition and PARAFAC decomposition are used to reduce the multidimensional NBI data sets into smaller sets that are used as a basis for clustering and prediction. Four applications on the NBI database are discussed in this work. The first application involves a …
-
INVESTIGATION OF CHEMOMETRICS METHODS FOR CHARACTERISING DRIFT PHENOMENA IN iCK-AES
… statistical methods and a multi-way approach. PARAFAC. were then employed to describe the system. The use of intemal standards to correct for drift has also been investigated, but found to be of benefit only under certain defined conditions (i.e. robust conditions, high RF power and low …
-
Assessment and characterization of dissolved organic nitrogen removal in simulated soil aquifer treatment systems
… in different defined regions. We fitted a PARAFAC model with four components to our data that was able to be compared with other models across different aquatic systems. The main component of the model (C1) was attributed to the aromatic molecules of terrestrial origin and associated with …
-
Marsh-Exported Dissolved Organic Matter Fate in Estuaries
… analyzed using parallel-factor analysis, PARAFAC). 0.2 μm filters were used for “photochemical-only” treatments, whereas glass-fiber filters (GF/Fs) were used for microbial treatments. Initial results indicated the presence of bacterial cells in 0.2 μm filtrates; however, heating the …
-
Redox cycling of colloidal macro- and micro-nutrients in a monomictic lake
… were analyzed using parallel factor analysis (PARAFAC), identifying two humic-like fluorophores and one protein-like fluorophore in both colloidal and dissolved size fractions. DOM in the lake showed marked seasonality with greater production and turnover during the summer season. This study …
-
Behaviour of trace organics and dissolved organic matter in granular activated carbon filters for drinking water supply
Granular and biological activated carbon (GAC and BAC) filters are widely used to remove organic compounds from drinking water sources during municipal drinking water treatment. Common uses of GAC filters include removal of taste and odour (T&O) causing compounds such as geosmin and …
-
Improvements on Instrumentation to Explore the Multidimensionality of Luminescence Spectroscopy
This dissertation presents experimental and instrumentation developments that take full advantage of the multidimensional nature of line narrowing spectroscopy at liquid nitrogen (77 K) and liquid helium (4.2 K) temperatures. The inconvenience of sample freezing procedures is eliminated with the …