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 14 of 14 for “"Low field NMR"”.
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A low-field NMR tool for soil moisture
… in a non-invasive way, the development of a low-field NMR sensor has been undertaken in this dissertation. Based on prior designs of low-field NMR instruments like the NMR-MOUSE and the well logging tools, two conceptual designs has been evaluated. One of these designs was chosen for …
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Low field NMR for analysis of rubbery polymers
… (TPU) and filled raw EPDM samples. The NMR measurements were restricted to transverse relaxation of the magnetization and DQ NMR experiments, done on a low field spectrometer (0.5 T) at a proton Larmor frequency of 20 MHz. The measurement temperatures were varied, depending on the glass …
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Application of MRI and low-field NMR in biopharmaceutical development
… paramount. To date, nuclear magnetic resonance (NMR) has had limited application in upstream bioprocessing, stemming from the use of high-field NMR systems that require large capital expenditure, specialised facilities, and high maintenance costs. The development of low-field, or benchtop, NMR …
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Profiling of Relaxation Time and Diffusivity Distributions with Low Field NMR
Nuclear magnetic resonance (NMR) is a common tool utilized in core analysis. NMR can reveal important information about pore structure, fluid configuration and wettability. However, standard NMR core analysis techniques look at the sample as a whole or only at thin slices. Two NMR pulse sequences …
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Characterization of tight and shale unconventional gas reservoirs using low field NMR
… significant value in reserve estimation and flow modelling. These characteristics are challenging parameters to measure. On the other hand, oil and gas sectors are continually looking for ways to do more with less environmental impact and greater operational efficiency. Nuclear Magnetic …
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Characterization of natural porous media by NMR and MRI techniques : high and low magnetic field studies for estimation of hydraulic properties
… phenomena in soils, Nuclear Magnetic Resonance (NMR) can be used successfully for the characterization of natural porous media. The aim of this thesis is to apply different NMR techniques for: i) understanding the relaxometric properties of unsaturated natural porous media and ii) for a reliable …
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The Greener Alternative: Sustainable Development in Iron Catalysis and Biodegradable Polymers
… in-situ pressure nuclear magnetic resonance (NMR) investigation, we made an unprecedented discovery that has vast implications for the understanding of nitrile hydrogenation mechanisms. We found crucial evidence of two oligomeric intermediate cascades governed by imine self-condensation and …
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Studies in process analysis and control in batch reactors
… and sampling, linked to the implementation of NMR and HPLC on-line analysers, are presented as key areas in this development work. Also, part of the engineering work surnmarised in this thesis assisted the work of other researchers who participated in the project. In the area of sampling, the …
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A multifactorial investigation of the capacities of lipid-soluble dietary antioxidants to suppress the thermally induced generation of Lipid Oxidation Products and alternative methods of detection.
… such as nuclear magnetic resonance spectroscopy (NMR) can measure these aldehyde species but have limitations that prevent its use in a wider-industry focused market. Recently, low-field NMR (LF-NMR) instruments have been developed offering potential crosscutting tools for adoption as a point of …
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Dynamics of liquids in porous media: Investigating competitive adsorption using NMR relaxometry
… has been focused towards the development of NMR relaxometry methods to investigate competitive adsorption and microphase separation of liquid mixtures imbibed within porous media. The work was done on three different mesoporous catalysts and catalyst supports, namely anatase titania, …
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Study on the processing technology of iced roasted sweet potato and its sensory characteristics and nutritional peculiarities
… both rich in protein and dietary fiber, with low gross energy and fat. After roasting, the starch and protein contents declined, while total phenolic content and antioxidant activity were increased, and most of vitamins are preserved. In addition, the comprehensive nutritional value of Yanshu …
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Structure property relationships in polyolefins
… changes are studied with high sensitivity using low and high field solid state nuclear magnetic resonance (NMR), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), infrared spectroscopy (IR) and X-ray diffraction (XRD). The results obtained by NMR are in good …
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Using High-Powered, Frequency-Narrowed Lasers For Rb/129Xe and Cs/129Xe Spin-Exchange Optical Pumping To Achieve Improved Production of Highly Spin-Polarized Xenon For Use In Magnetic Resonance Applications
<p>Nuclear magnetic resonance (NMR) spectroscopy has been extensively used to investigate numerous systems of interest, ranging from collections of molecules to living organisms. However, NMR suffers from one key drawback: an inherent lack of detection sensitivity, as compared to other common forms …
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Advances in studying order and dynamics in condensed matter by NMR
Why NMR? Because it is so informative for so many different types of applications. Since the discovery of the basic phenomenon in 1945, the field of NMR was continuously growing. NMR spectroscopy and relaxometry are powerful analytical techniques in material science and biochemistry. Magnetic …