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 18 of 18 for “"chemical identification"”.
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Chemical identification under a poisson model for Raman spectroscopy
Raman spectroscopy provides a powerful means of chemical identification in a variety of fields, partly because of its non-contact nature and the speed at which measurements can be taken. The development of powerful, inexpensive lasers and sensitive charge-coupled device (CCD) detectors has led to …
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Abscorbic acid (Vitamin C) in human urine. Its chemical identification and quantitative determination
PART I. The chemical identification of vitamin C in human urine by isolation of the 2 :4- d.ínitrophenylhydrazine derivative of dehydroascorbic acid.
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Chemical Identification and Flavor Profile Analysis of Iodinated Phenols Produced From Disinfection of Spacecraft Drinking Water
… Spectrometry (GC/MS) were used for identification and quantitative analysis of phenolic compounds. Spectrophotometry was used to monitor the iodine concentrations. Falvor Profile analysis (FPA) method was used to evaluate the odor characteristics of the phenolic compounds. Reactions …
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Chemical Identification and Organoleptic Evaluation of Iodine and Iodinated Disinfection By-Products Associated with Treated Spacecraft Drinking Water
Aboard the International Space Station, potable water will likely be produced from recycled wastewater. The National Aeronautic and Space Administration (NASA) plans to use iodine as a disinfectant, and, consequently, the formation of iodinated disinfection by-products (IDBPs) requires …
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Towards terahertz dual-comb spectroscopy based on quantum cascade lasers
… broadband THz spectroscopy system for chemical identification and explosive detection.
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Improving vacuum ultraviolet spectroscopy using instrumental modifications and chemometric applications.
… GC and MS libraries of hundreds of thousands of chemicals allow rapid and accurate identification of most analytes using GC-MS. Vacuum Ultraviolet (VUV) spectroscopy is a technique that, like MS, is useful for both qualitative and quantitative measurements of gas-phase molecules. Although VUV …
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A Hazard Assessment of a Landfill Site
… at strategic positions across the site and chemical analysis carried out to identify the exact composition of the waste, and the composition of both the venting gas and ground water in order to assess the threat to nearby housing and the surrounding environment.<br/><br/>Chemical analysis …
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Fast Identification of Components Commonly Used in Homemade Explosives by Spectroscopic and Chemometric Methods
… forensic research <a></a>focuses on developing identification methods that can provide quick, cost effective, non-destructive analysis using portable instrumentation. These capabilities would be invaluable to first responders, military, and security officials to establish an evidentiary link …
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Development of geochemical identification and discrimination by Raman spectroscopy. The development of Raman spectroscopic methods for application to whole soil analysis and the separation of volcanic ashes for tephrachronology
… texture and mineral content by physical or chemical methods. However, these methods leave any organic or water-soluble fractions unexamined. Tephrochronology (the dating of sedimentary sequences using volcanic ash layers) is an important tool for the dating and correlation of sedimentary …
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Bridging the Modeling-Sampling Gap for Mid-Infrared Reflectance Spectroscopy of Small Particles, Films, and Fibers
… the conventional DC response via enhancing the chemical contrast in the image which enables detection of stains of interest. We also exploit a "like-detects-like" filtering approach to demonstrate a method of using a broadband thermal detector for chemical identification applications.</p>
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Tip-based nanomanufacturing and metrology of heterogeneous nanostructures
… dissertation presents controlled fabrication and chemical identification of heterogeneous nanostructures using atomic force microscope (AFM) cantilevers. Fabrication and integration of different chemical structures at the nanometer scale is essential for constructing the next generation of …
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X-RAY CHARACTERIZATION OF PLATINUM GROUP METAL CATALYSTS
… spectroscopy provides information about the chemical state and local structure of selected atoms. From the average nearest neighbor coordination numbers, crystallite sizes can also be inferred, with particularly high sensitivity in the sub-nm size range. Electron microscopy complements …
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A comprehensive study of the electrochemistry and floatability of pyrite in coal flotation
… photoelectron spectroscopy (XPS) was used for chemical identification of oxidation products. Galvanic coupling with sacrificial anodes was investigated as a practical method to cathodically protect pyrite and prevent its oxidation. Microflotation tests were conducted under controlled potentials …
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Understanding Electrode-Electrolyte Interfaces with Metal Dissolution and Redeposition Chemistry
… and batteries) with superior electrochemical performances. We firstly demonstrate the feasibility of resynthesizing the electrode surface chemistry and tuning the electrochemical reactions at the solid-liquid interface by selectively changing the electrolyte composition and …
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Advances in Raman hyperspectral compressive detection instrumentation for fast label free classification, quantitation and imaging
… have proven to be useful for fast, label-free chemical identification, quantitation and imaging. The CD spectrometer consists of a volume holographic grating (VHG) that linearly disperses the Raman photons into its component wavelengths and all wavelengths are focused onto a digital micromirror …
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Mass Spectrometry Imaging: Looking Fruits at Molecular Level
… of specific data analysis tool to enhance the chemical identification in untargeted MSI (chapter 3). MALDI imaging allows high-spatial localization analysis of metabolites, but it is not suitable for applications where rapid and high throughput analysis is required when the absolute …
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Micrometer-scale chemical analysis using heated AFM cantilever and mass spectrometer
… presents the development of a micrometer-scale chemical analysis method using a heated atomic force microscope(AFM) cantilever and mass spectrometer. Simulations investigate the underlying transport mechanisms within the system and the impact of various design parameters. The way to optimize the …
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Studies of microplastics present in sewage sludge, effects on amended agricultural soils
… an alternative, stable against most of the mild chemical existing treatments. Two portions of H2O2 were used given its property of bleaching while rational heating, according to Sujathan et al., (2017). The last protocol was an enhanced version of Löder et al., (2017) study. Data collection …