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 117 for “"Extraction techniques"”.
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Comparative extraction techniques for environmental pollutants
By addressing new sample preparation techniques, the U.S. Environmental Protection Agency (EPA) has recently implemented research programs to reduce or abolish laboratory pollution. In the work reported here, EPA Method 8270, established for Priority Pollutant Organics, will be evaluated by both …
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Development of membrane extraction techniques for water quality analysis
… the development of membrane-based analytical techniques as applied to various aspects of water quality analysis. Gas injection membrane extraction was developed for fast on-line analysis of volatile organic compounds in water. Gas injection of aqueous samples increased the speed of membrane …
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Unsupervised Feature Extraction Techniques for Plasma Semiconductor Etch Processes
… of advanced algorithms for e®ective feature extraction. In this thesis, three new unsupervised feature extraction algorithms have been proposed for OES data analysis and the algorithm properties have been explored with the aid of both arti¯cial and industrial benchmark data sets. The ¯rst …
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Comparison of Extraction Techniques for Δ-9-Tetrahydrocannabinol from Urine
… Δ-9-THC and glucuronic acid before an alkaline extraction. Δ-9-THC has a pKa of 10.6 and therefore is always extracted at an alkaline pH. In this study, both a strong solution ofNaOH and the enzyme were used to break the glucuronide bond in urine samples and the result obtained from each …
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Polonium extraction techniques for a lead-bismuth cooled fast reactor
… inhibited proper sample analysis. The extraction techniques of rare-earth filtering and polonium hydride stripping and their relative figures of merit were discussed. Of the two techniques, a small-scale design adopting polonium hydride stripping was explored to address basic issues of …
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Investigating Various Modal Analysis Extraction Techniques to Estimate Damping Ratio
… their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. Also, as a consequence of all this work, there are some other works devoted to the evaluation and comparison of these methods in order to find which one …
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Overloaded Array Processing: System Analysis, Signal Extraction Techniques, and Time-delay Estimation
… of complex overloaded array signal processing techniques. An extensive literature survey on narrowband signal extraction algorithms shows that joint detection schemes, coupled with antenna arrays, provide a solution for narrowband overloaded array problem where as traditional beamforming …
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A comparison of extraction techniques for the determination of metals in soil
… geological metal contaminants in soil. Current extraction methods, such as hot acid extraction, result in the digestion of the sample matrix which may obscure the origin of the contaminant. Since metals from anthropological sources are most often adsorbed to the surface of the soil sediment, the …
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Optimization of extraction techniques for the isolation and pre-concentration of pharmaceuticals in aquatic environments
Dissertation submitted in fulfilment of the requirements for the degree Master of Applied Science: Chemistry, Durban University of Technology, 2021.
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A comparative study of stress intensity factor extraction techniques for the generalized finite element method
… a comprehensive study of stress intensity factor extraction techniques: The Contour Integral Method (CIM), the Cut-off Function Method (CFM) and the Displacement Correlation Method (DCM). A few techniques are also shown to improve Displacement Correlation Method with the use of additional sampling …
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Optimization of environmental DNA collection and extraction techniques for early detection of aquatic invasive species
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Optimisation of selective extraction techniques as a tool for geochemical mapping in the Southern Africa region
… may be ascribed to the use of various partial extraction techniques,without a profound understanding of the regolith components and their composition. This investigation therefore focuses on the use of hydroxylamine partial extraction geochemistry for geochemical mapping in regolith over two …
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From a Public Health Perspective: Fracking and Other Unconventional Oil and Gas Extraction Techniques in California
… associated with fracking and other oil and gas extraction methods. The following paper is a summary of a 300- hour field work experience completed at the CEH’s Healthy Energy Choice Program specifically with an analyzes of the public health effects associated with fracking and other oil and gas …
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Improving Off-line and On-line Supercritical Fluid Extraction Techniques by Elevating the Post-Restrictor Pressure
… single greatest problem with supercritical fluid extraction techniques. As a result of these high flow rates, solvent trapping is not efficient in many cases, and the more complicated sorbent trapping technique must be used. In addition, loss of the collection solvent may occur during the process …
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Arabic Language Processing for Text Classification. Contributions to Arabic Root Extraction Techniques, Building An Arabic Corpus, and to Arabic Text Classification Techniques.
… improvement of available automatic processing techniques such as root extraction methods or text classification techniques, and for developing text collections that are already labeled, whether with single or multiple labels. This thesis proposes new ideas and methods to improve available …
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Arabic Language Processing for Text Classification. Contributions to Arabic Root Extraction Techniques, Building An Arabic Corpus, and to Arabic Text Classification Techniques.
… improvement of available automatic processing techniques such as root extraction methods or text classification techniques, and for developing text collections that are already labeled, whether with single or multiple labels. This thesis proposes new ideas and methods to improve available …
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Benchmarking authorship attribution techniques using over a thousand books by fifty Victorian era novelists
… lot of classification methods for which feature extraction techniques are conducted. In this thesis, we explore information retrieval techniques such as Word2Vec, paragraph2vec, and other useful feature selection and extraction techniques for a given text with different classifiers. We have …
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The recovery of phenolic antioxidants from fruit processing wastewaters of South Africa by Chipo H. Mupure.
… determination of antioxidant activity and the extraction of phenolic antioxidants from fruit processing wastewaters obtained from fruit processors in the Western Cape region of South Africa, using various extraction techniques. The chemical analysis of the fruit processing wastewaters showed …
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Profiling studies of five Namibian indigenous seed oils obtained using three different extraction methods
… quality characteristics among three different extraction techniques, namely the traditional extraction method, machine-operated cold pressing and Soxhlet extraction. The oils studied were Citrullus lanatus (Kalahari melon) oil, Schinziophyton rautanenii (Schinz) Radcl.-Sm. (Manketti) nut oil, …
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